CLAST Statistics and Probability 2

Question 1

A data set has values: 4, 7, 7, 9, 13. What is the mode?

Accepted Answer

7

Answer

The mode is the value that appears most frequently, which is 7 (appears twice).

Question 2

If the probability of rain on any given day is 0.3, what is the probability that it does NOT rain?

Accepted Answer

0.7

Answer

The complement rule states P(not A) = 1 − P(A), so 1 − 0.3 = 0.7.

Question 3

A bar graph shows sales of 40 in January, 55 in February, and 35 in March. What is the mean monthly sales?

Accepted Answer

43.3

Answer

Mean = (40 + 55 + 35) / 3 = 130 / 3 ≈ 43.3.

Question 4

Which measure of central tendency is most affected by an extreme outlier?

Accepted Answer

Mean

Answer

The mean is calculated using all values, so a single extreme outlier can significantly shift it.

Question 5

A bag contains 5 red, 3 blue, and 2 green marbles. If one marble is drawn at random, what is the probability it is blue?

Accepted Answer

3/10

Answer

P(blue) = 3 / (5+3+2) = 3/10.

CLAST - College Level Academic Skills Test Practice Test