9. A class consists of 10 males and 30 females. If one student is randomly selected from the class, what is the probability of selecting a male?

a. 10/30 c. 1/10

b. 10/40 d. 1/40

10. A class consists of 10 males and 30 females. A random sample of n = 3 students is selected. If the first two students are both females, what is the probability that the third student is a male?

a. 10/37 c. 10/40

b. 10/38 d. 8/38

11. Which of the following accurately describes the proportions in the tails of a normal distribution?

a. Proportions in both tails are positive.

b. Proportions in the right-hand tail are positive, and proportions in the left-hand tail are negative.

c. Proportions in the right-hand tail are negative, and proportions in the left-hand tail are positive.

d. Proportions in both tails are negative.

12. What proportion of a normal distribution is located in the tail beyond z = –1.00?

a. 0.8413 c. –0.3413

b. 0.1587 d. –0.1587

13. What proportion of a normal distribution is located between the mean and z = 1.40?

a. 0.9192 c. 0.4192

b. 0.0808 d. 0.8384

14. What proportion of a normal distribution is located between the mean and z = –1.40?

a. 0.0808 c. –0.0808

b. 0.4192 d. –0.4192

15. What is the probability of randomly selecting a z-score less than z = –1.25 from a normal distribution?

a. 0.8944 c. 0.3944

b. 0.1056 d. 0.2112

16. A normal distribution has μ = 80 and σ = 10. What is the probability of randomly selecting a score greater than 90 from this distribution?

a. p = 0.8413 c. p = 0.3085

b. p = 0.1587 d. p = 0.6915

17. A normal distribution has a mean of µ = 70 with σ = 10. If one score is randomly selected from this distribution, what is the probability that the score will be greater than X = 82?

a. 0.7698 c. 0.1151

b. 0.3849 d. 0.8849

18. A normal distribution has a mean of µ = 100 with σ = 20. If one score is randomly selected from this distribution, what is the probability that the score will be less than X = 84?

a. 0.7881 c. 0.2881

b. 0.5762 d. 0.2119

Subject | General |

Due By (Pacific Time) | 07/15/2014 01:37 pm |

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