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- 1. Multiple ChoiceThe weight of written reports produced in a certain department has a Normal distribution with mean 60 g and standard deviation 12 g. The probability that the next report will weigh less than 45 g is.1056.3944.1042.8944
- 2. Multiple Choice
Is this a probability distribution?NoYes - 3. Multiple ChoiceIs this a probability distribution?NoYes
- 4. Multiple ChoiceThe probability of each value of the random variable must be between or equal to ________?010 and 1none of the above
- 5. Multiple ChoiceWhat is the difference between a discrete random variable and a continuous random variable?A discrete random variable takes all values in an interval of numbers while a continuous random variable has a fixed set of possible values with gaps between.A discrete random variable has a fixed set of possible values with gaps between while a continuous random variable takes all values in an interval of numbers.A discrete random variable takes only negative numbers while a continuous random variable takes both positive and negative numbers.A discrete random variable takes both positive and negative numbers while a continuous random takes only negative numbers.
- 6. Multiple Choice
If Gonzalo's score is 87%, the class average is 82%, and the SD is 4, what is Gonzalo's Z-score?
-1.25
+1.25
+1.20
+1.02
- 7. Multiple ChoiceA marketing survey compiled data on the number of cars in households. If X = the number of cars, and we omit the rare cases of more than 5 cars, then X has the following probability distribution:
X 0 1 2 3 4 5
P(X) 0.24 0.37 0.20 0.11 0.05 0.03
What is the probability that a randomly chosen household has at least two cars?0.200.290.390.61 - 8. Multiple ChoiceThe table represents the probability of guessing correct on a 5 question true-false quiz. Find the probability for at least 4 questions correct..03125.15625.3125.1875
- 9. Multiple ChoiceA tennis player makes a successful first serve 60% of the time. If she serves 20 serves, what is the mean number of good first serves? Assume that each serve is independent.1218815
- 10. Multiple ChoiceA stockbroker estimates that at the end of the year, there is a 40% chance a stock will be worth $50, a 35% chance it will be worth $60 and a 25% chance it will be worth $70.
What expected value does this broker assign to this stock's end-of-the-year price?$58.50$60.00$62.50$65.00 - 11. Multiple Choice
The weights of grapefruits of a certain variety are approximately Normally distributed with a mean of 1 pound and a standard deviation of 0.12 pounds.
Which of the following is closest to the probability that a randomly-selected grapefruit weights more than 1.25 pounds?
0.0186
0.0156
0.3156
0.4013
0.5987
- 12. Multiple Choice
The weights of grapefruits of a certain variety are approximately Normally distributed with a mean of 1 pound and a standard deviation of 0.12 pounds.
Which of the following is closest to the probability that a randomly-selected grapefruit weights less than 1.25 pounds?
0.0186
0.0156
0.1056
0.8944
0.9814
- 13. Multiple Choice
Let X be the outcome of rolling a fair six-sided die. Find
1/6
1/3
1/2
2/3
5/6
- 14. Multiple Choice
An algebra 2 test has 6 multiple choice questions with four choices with one correct answer each. If we just randomly guess on each of the 6 questions, what is the probability that you get exactly 3 questions correct?
0.962
0.132
0.831
0.250
- 15. Multiple ChoiceThe American Red Cross says that about 11% of the U.S. population has Type B blood. A blood drive is being held at your school. What is the probability that at least 2 of the first 10 blood donors has Type B blood?0.0880.6970.2140.303
- 16. Multiple Choice
Find the mean of a binomial distribution with n=50 and p=0.4
50
4
20
10
- 17. Multiple ChoiceIf the height of a randomly selected woman is normally distributed with mean of 64.5 in and st. dev of 2.5 in, what proportion of women are between 65 and 67 inches?0.140.16Not here0.58
- 18. Multiple ChoiceIn a particular game, a fair die is tossed. If the number of spots showing is either 4 or 5 you win $1, if the number of spots showing is 6 you win $4, and if the number of spots showing is 1, 2, or 3 you win nothing. Let X be the amount that you win.
Which of the following is the expected value of X?$1.00$2.50$4.00$6.00 - 19. Multiple Choice
Find the missing value for P(X=5) in the probability ditribution:
Number of Toys | Probability
0| 0.03
1| 0.16
2| 0.30
3| 0.23
4| 0.17
5| ?
0.11
0.21
0.01
0.31
- 20. Multiple ChoiceWhen rolling a fair die 100 times, what is the probability of rolling a "4"exactly 25 times?0.0100.1670.250.021
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