1) If all the points fall on a straight line, the value of r will be ........... or ..........

A. 1 or -1 C. 0 or -1

B. 0 or 1 D. 1 or 0

2) The average labor cost for car repairs for a large chain of car repair shops is RM46.2. The standard deviation is 8. Assume the variable is normally distributed. If a store is selected at random, the probability that the labor cost will be less than RM43 is

A. 0.3446 C. 0.2456

B. 0.4332 D. 0.2826

3) student takes a 10-question, true -false exam and guesses on each question. The probability of answering 6 correct out of 10 is

A. 0.1172 C. 0.2051

B. 0.0439 D. 0.0097

4) It is important to keep the width of each class the same in a

A. frequency distribution C. time series graph

B. Cummulative frequency D. Bar-chart

5) Two groups of people are surveyed. It is found that in a sample of 40 drivers, single mean drive an average of 85 work-related miles per week, while a sample of 45 married mean shows that they travel an average of 80 work-related miles per week. The standard deviations are 12 and 8 miles, respectively. The test statistic value for the difference is

A. 2.23 C. 3

B. 2.55 D. 3.22