Probability Exercise 2

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1 Probability Exercise 2 1 Question 9 A box contains 5 red marbles, 8 white marbles and 4 green marbles. One marble is taken out of the box at random. What is the probability that the marble taken out will be? (i) red? (ii) white? (iii) not green? Given No. of red marbles(r) = 5 No. of white marbles (w)=8 No. of green marbles(g) = 4 Total no. of balls(n) = = 17 (i) Number of Favorable outcome to event (Red marble) =r= 5 Probability of taking out red marble =r/n= 5/17 (ii) Number of Favorable outcome to event (white marble) =w= 8 Probability of taking out red marble = w/n=8/17 (iii) Number of Favorable outcome to events (no green) = r+w=13 Probability of taking out (not green) = 13/17 Question 10 A piggy bank contains hundred 50p coins, fifty Rs1 coins, twenty Rs2 coins and ten Rs5 coins. If it is equally likely that one of the coins will fall out when the bank is turned upside down, what is the probability that the coin (i) will be a 50 p coin? (ii) will not be a Rs5 coin? Given No. of 50p coins = 100 No. of Rs1 coins = 50 No. of Rs2 coins = 20 No. of Rs5 coins = 10 Total no. of coins = = 180 (i) Number of Favorable outcome to event (50p coin) = 100

2 Probability that it will be 50p coins = 100/180 = 5/9 2 (ii) Number of Favorable outcome to event (not Rs 5 coin) =All the coins except Rs5 coin= = 170 Probability that it will be 50p coins = 170/180 = 17/18 Question 11 Gopi buys a fish from a shop for his aquarium. The shopkeeper takes out one fish at random from a tank containing 5 male fish and 8 female fish (see Fig. 15.4). What is the probability that the fish taken out is a male fish? Given No. of male fish in the tank(m) = 5 no. of female fish in the tank(f) = 8 Total number of fish in the tank (n)= = 13 Then Number of Favorable outcome to event (male fish) =m= 5 Probability of taking out a male fish =m/n= 5/13 Question 12 A game of chance consists of spinning an arrow which comes to rest pointing at one of the numbers 1, 2, 3, 4, 5, 6, 7, 8 (see Fig. 15.5), and these are equally likely outcomes. What is the probability that it will point at (i) 8? (ii) an odd number? (iii) a number greater than 2? (iv) a number less than 9?

3 3 Total Possible no. of events(n) = 8 (i) Number of Favorable outcome to event (8)= 1 Probability that it will point at 8 = 1/8 (ii) Odd numbers = 1, 3, 5 and 7 Number of Favorable outcome to event (odd number)= 4 Probability that it will be an odd number = 4/8 = 1/2 (iii) Numbers greater than 2 will be 3, 4, 5, 6, 7 and 8 So Number of Favorable outcome to event (Numbers greater than 2)= 6 Probability that a number greater than 2 = 6/8 = 3/4 (iv) Numbers less than 9 = 1,2,3,4,5,6,7,8 Number of Favorable outcome to event (Numbers less than 9)= = 8 Probability that a number less than 9 = 8/8 = 1 So it is a sure event Question 13 A die is thrown once. Find the probability of getting (i) a prime number; (ii) a number lying between 2 and 6; (iii) an odd number. Possible numbers of events on throwing a dice(n) = 6 Numbers on dice = 1,2,3,4,5 and 6 (i) Now Prime numbers = 2, 3 and 5 So Number of Favorable outcome to event (prime number)= 3 Probability that it will be a prime number = 3/6 = 1/2 (ii) Now Numbers lying between 2 and 6 = 3, 4 and 5 So Number of Favorable outcome to event (Numbers lying between 2 and 6) = 3 Probability that a number between 2 and 6 = 3/6 = 1/2 (iii) Now Odd numbers = 1, 3 and 5 Number of Favorable outcome to event (odd numbers) = 3 Probability that it will be an odd number = 3/6 = 1/2 Question 14 One card is drawn from a well-shuffled deck of 52 cards. Find the probability of getting (i) a king of red colour (ii) a face card

4 (iii) a red face card (iv) the jack of hearts (v) a spade (vi) the queen of diamonds 4 Possible numbers of events = 52 (i) Numbers of king of red colour = 2 Probability of getting a king of red colour = 2/52 = 1/26 (ii) Numbers of face cards = 12 Probability of getting a face card = 12/52 = 3/13 (iii) Numbers of red face cards = 6 Probability of getting a king of red colour = 6/52 = 3/26 (iv) Numbers of jack of hearts =1 Probability of getting a king of red colour = 1/526 (v) Numbers of king of spade = 13 Probability of getting a king of red colour = 13/52 = 1/4 (vi) Numbers of queen of diamonds = 1 Probability of getting a king of red colour = 1/52 Question 15 Five cards the ten, jack, queen, king and ace of diamonds, are well-shuffled with their face downwards. One card is then picked up at random. (i) What is the probability that the card is the queen? (ii) If the queen is drawn and put aside, what is the probability that the second card picked up is (a) an ace? (b) a queen? Total numbers of cards = 5 (i) Numbers of queen = 1 Probability of picking a queen = 1/5 (ii) When queen is drawn and put aside then total numbers of cards left is 4 (a) Numbers of ace = 1 Probability of picking an ace = 1/4 (a) Numbers of queen = 0 Probability of picking a queen = 0/4 = 0

5 5 Question defective pens are accidentally mixed with 132 good ones. It is not possible to just look at a pen and tell whether or not it is defective. One pen is taken out at random from this lot. Determine the probability that the pen taken out is a good one. Given Numbers of defective pens(d) = 12 Numbers of good pens(g) = 132 Total numbers of pen =d+g= = 144 pens Number of Favorable outcome to event (good pen) = 132 Probability of getting a good pen = g/(d+g)=132/144 = 11/12 Question 17 (i) A lot of 20 bulbs contain 4 defective ones. One bulb is drawn at random from the lot. What is the probability that this bulb is defective? (ii) Suppose the bulb drawn in (i) is not defective and is not replaced. Now one bulb is drawn at random from the rest. What is the probability that this bulb is not defective? (i) Total numbers of bulbs = 20 Numbers of defective bulbs = 4 Probability of getting a defective bulb = 4/20 = 1/5 (ii) One non defective bulb is drawn in (i) then the total numbers of bulb left is 19 Total numbers of events = 19 Favorable numbers of events = 19-4 = 15 Probability that the bulb is not defective = 15/19 Question 18 A box contains 90 discs which are numbered from 1 to 90. If one disc is drawn at random from the box, find the probability that it bears (i) a two-digit number (ii) a perfect square number (iii) a number divisible by 5. Total numbers of discs = 90 (i) Number of Favorable outcome to event (two digit number) = 81 Probability that it bears a two-digit number = 81/90 = 9/10

6 6 (ii) Perfect square numbers are 1, 4, 9, 16, 25, 36, 49, 64 and 81 So Number of Favorable outcome to event (Perfect square numbers )= 9 Probability of getting a perfect square number = 9/90 = 1/10 (iii) Numbers which are divisible by 5 are 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85 and 90 So Number of Favorable outcome to event (Numbers which are divisible by 5 )= 18 Probability of getting a number divisible by 5 = 18/90 = 1/5 Question 19 A child has a die whose six faces show the letters as given below: The die is thrown once. What is the probability of getting (i) A? (ii) D? Total numbers of events = 6 (i) Total numbers of faces having A on it = 2 Probability of getting A = 2/6 = 1/3 (ii) Total numbers of faces having D on it = 1 Probability of getting A = 1/6 Question 20 Suppose you drop a die at random on the rectangular region shown in Fig What is the probability that it will land inside the circle with diameter 1m? Area of the rectangle = (3 2) m 2 = 6m 2 Area of the circle = πr 2 = π(1/2) 2 m 2 = π/4 m 2 Probability that die will land inside the circle = (π/4) 1/6 = π/24 Question 21

7 A lot consists of 144 ball pens of which 20 are defective and the others are good. Nuri will buy a pen if it is good, but will not buy if it is defective. The shopkeeper draws one pen at random and gives it to her. What is the probability that? (i) She will buy it? (ii) She will not buy it? Total numbers of pens = 144 Numbers of defective pens = 20 Numbers of non defective pens = = 124 (i) Numbers of favorable events = 124 Probability that she will buy it = 124/144 = 31/36 (ii) Numbers of favorable events = 20 Probability that she will not buy it = 20/144 = 5/36 Question 22. Refer to Example 13. (i) Complete the following table: 7 (ii) A student argues that there are 11 possible outcomes 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12. Therefore, each of them has a probability 1/11. Do you agree with this argument? Justify your answer. Events that can happen on throwing two dices are: (1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (1, 6) (2, 1), (2, 2), (2, 3), (2, 4), (2, 5), (2, 6) (3, 1), (3, 2), (3, 3), (3, 4), (3, 5), (3, 6) (4, 1), (4, 2), (4, 3), (4, 4), (4, 5), (4, 6) (5, 1), (5, 2), (5, 3), (5, 4), (5, 5), (5, 6) (6, 1), (6, 2), (6, 3), (6, 4), (6, 5), (6, 6) Total numbers of events : 6 6 = 36 (i) To get sum as 2, possible outcomes = (1,1) To get sum as 3, possible outcomes = (1,2) and (2,1) To get sum as 4, possible outcomes = (1,3); (3,1); and (2,2) To get sum as 5, possible outcomes = (1,4); (4,1); (2,3); and (3,2) To get sum as 6, possible outcomes = (1,5); (5,1); (2,4); (4,2); and (3,3)

8 To get sum as 7, possible outcomes = (1,6); (6,1); (5,2); (2,5); (4,3); and (3,4) To get sum as 8, possible outcomes = (2,6); (6,2); (3,5); (5,3); and (4,4) To get sum as 9, possible outcomes = (3,6); (6,3); (4,5); and (5,4) To get sum as 10, possible outcomes = (4,6); (6,4) and (5,5) To get sum as 11, possible outcomes = (5,6) and (6,5) To get sum as 12, possible outcomes = (6,6) 8 Event: Sum on 2 dice Probabilit y /36 2/36 3/36 4/36 5/36 6/36 5/36 4/36 3/36 2/36 1/36 (ii) No, i don't agree with the argument. It is already justified in (i). 23. A game consists of tossing a one-rupee coin 3 times and noting its outcome each time. Hanif wins if all the tosses give the same result i.e., three heads or three tails, and loses otherwise. Calculate the probability that Hanif will lose the game. Events that can happen in tossing 3 coins = HHH, HHT, HTH, THH, TTH, HTT, THT, TTT Total number of events = 8 Hint if will lose the game if he gets HHT, HTH, THH, TTH, HTT, THT Favorable number of elementary events = 6 Probability of losing the game = 6/8 = 3/4 Question 24 A die is thrown twice. What is the probability that (i) 5 will not come up either time? (ii) 5 will come up at least once? [Hint: Throwing a die twice and throwing two dice simultaneously are treated as the same experiment] (i) Total possible outcome= 36 Number of favorable outcome when 5 comes at least once = 11 So Number of favorable outcome when 5 will not come up = 36-11=25 Required probability = 25/36 (ii) Number of favorable outcome when 5 comes at least once = 11 Probability = 11/36 Question 25

9 Which of the following arguments are correct and which are not correct? Give reasons for your answer. (i) If two coins are tossed simultaneously there are three possible outcomes two heads, two tails or one of each. Therefore, for each of these outcomes, the probability is 1/3 (ii) If a die is thrown, there are two possible outcomes an odd number or an even number. Therefore, the probability of getting an odd number is 1/2 (i) The statement is incorrect Possible events = (H, H); (H, T); (T, H) and (T, T) Probability of getting two heads = 1/4 Probability of getting one of the each = 2/4 = 1/2 (ii) Correct. The two outcomes considered are equally likely. 9

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