1A) In a set of 20 observations, the mean is 40 and the median is 30. There are two values that are 12 and all other values are different. What is the mode?

A) None of these

B) 12

C) 40

D) 30

E) 35

1B)

60% of people in North America wear glasses. In a survey of 49 people, what is the probability that the sample distribution of people who wear glasses is less than 70%. (Assume all the assumptions and conditions of a sampling distribution of proportion are satisfied. )

A) 0.4618

B) 0.9979

C) 0.9236

D) 0.0764

E) 0.4236