42.Using descriptive statistics, you have found out that it takes an average of 40 minutes to complete mid-term examination in ISDS 361 A. However, you were surprised to see that the median completion time is 55 minutes. This observation means that

Select one:

a. exam completion time is positively skewed

b. exam completion time is negatively skewed

c. exam completion time resembles the normal distribution

d. exam completion time is probably tri-modal

Question 43

One of the requirements of admission to most colleges is applicant's SAT score. Suppose that Mike's SAT score is more than 2 standard deviations from the average SAT score of those admitted to college X. Close inspection of the SAT scores of college X admitted students resemble the normal distribution. Then,

Select one:

a. Mike's z-score is at least 3

b. Mike's z-score is at least 2

c. Mike's z-score is about 1

d. Mike's z-score is -3

Question 44

For a normally distributed random variable X with mean = 50 and variance = 25, what is P(X > 60)?

Select one:

a. P(z >2)

b. P(z<2)

c. P(z >0.4)

d. P(z < -0.4)