number of favorable outcomes 2 1 number of favorable outcomes 10 5 = 12


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1 Probability (Day 1) Green Problems Suppose you select a letter at random from the words MIDDLE SCHOOL. Find P(L) and P(not L). First determine the number of possible outcomes. There are 1 letters in the two words, so there are 1 possible outcomes when you select a letter at random. Next determine of favorable outcomes for P(L). There are two L s. number of favorable outcomes 1 Thus, P(L) = number of possible outcomes = 1 = You can find P(not L) several ways. Since there are 1 possible outcomes and are L, 1 = 10 are not L. number of favorable outcomes 10 Thus, P(not L) = number of possible outcomes = 1 = Also P(not L) = 1  P(L) 1 = 1 = A drawer contains red socks, blue socks, and 1 white socks. A sock is pulled from the drawer at random. Find the probability for each case. 1. Red. Blue 3. Red or white. Red, white or blue. Not red. Green A spinner numbered from 1 to 0 is spun randomly. Find the probability of where the spinner lands for each case An odd number 9. A number divisible by 10.. A number with a 1 in it 1. A prime number 13. A number less than 1. A number 1. A number that is not less than A number divisible by 3 or
2 Find each probability for choosing a letter at random from the word PROBABILITY. 17. P(B) 18. P(P) 19. P(A or I) 0. P(not P) A box contains 7 red, 1 yellow, 1 green, and 8 purple marbles. A marble is drawn at random from the box. Find each probability. 1. P(red). P(yellow) 3. P(green or red). P(purple, yellow or red). P(not green). P(not purple, yellow or red) 7. The numerical values around the spinner indicate the measure of the central angle for each sector of the circle. Using the fair spinner, what is the probability of getting Ahead 3 spaces? Express your answer as a common fraction. 8. What is the probability that a point chosen inside the largest rectangle is not within a shaded region? Express your answer as a common fraction What is the probability of Jonah picking a vowel if he randomly chooses a letter from the word CAT? Express your answer as a common fraction. 30. There are six bottles of soda, three bottles of juice and one bottle of water in a cooler. If a bottle is randomly selected from the cooler, what is the probability that it is the bottle of water? Express your answer as a common fraction. 31. Top Notch Nose Contest Schnoz Elementary School decided to hold a Top Notch Nose Contest as a
3 fundraising activity. Each contestant submitted a photograph of his or her pet featuring the pet s nose, along with an entrance fee of $1.00. Half of the photographs submitted were pictures of cats. A quarter of the photographs received were pictures of dogs, 1/8 were pictures of horses, 1/1 were pictures of rabbits, and 13 were gerbils. Only 1/3 of the photos were picture of birds. How many photos of pets were entered in the contest? Extra: If each pet had an equal chance of winning, what s the probability that a rabbit s photograph was the winner? Probability (Day 1) Green Solutions
4 Since Ahead 3 spaces occupies 100 degrees out of the 30 degrees in the circle, the probability that the spinner will land there is 100 = 10 = There are three differentsized regions within the rectangle. Notice that there are five of each size, and one of each size is shaded. Since 1 of each set is shaded, then 1 of the entire rectangle is shaded, and the probability of choosing a point within a shaded region is also 1. The probability of choosing a point not within a shaded region, then, is 1 1 =. 9. There are three letters in the word CAT, only one of which is a vowel. Thus, the probability of Jonah picking a vowel at random is one out of three or 1/ The bottle of water is one of the 10 bottles, so the probability that a randomly selected bottle is the water bottle is 1/ There were 1 photographs of pets entered in the contest. *EXTRA*  The probability that a rabbit s photograph was the winner is /1 = 1/1. What I did was do the problem in language first. X = Total number of pets. So, X = Cats (x) + Dogs (x) + Horses (x) + Rabbits (x) + Birds (x) + Gerbils. Then, I substituted them for numbers. Then I added 1/x + 1/x + 1/8x + 1/1x + 1/3x When I added all of the fractions, the sum was 31/3. The equation was now X = 31/3x from 31/3x and from X. Now, the equation was 1/3x = 13. To get X alone, I divided 1/3 from both X and 13. For X, the quotient I got was 1. That was how many animals were entered in the contest. *EXTRA*  There are rabbits. I got 1/1 as the probability that a rabbit s photo was the winner by doing /1 and I simplified the fraction.
5 Bibliography Information Teachers attempted to cite the sources for the problems included in this problem set. In some cases, sources were not known. Problems Bibliography Information 31 The Math Drexel ( Math Counts ( 1  Davison, David M. Prentice Hall Pre Algebra Tools for a Changing World. Needham, Mass: Prentice Hall, 001. Print.
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