Data Set 7-4: a Set of Scores with a Mean

Multiple Choice

Data Set 7-4: A set of scores with a mean of 16 and a standard deviation of 3.
-Look at Data Set 7-4. Suppose 200 persons received scores during a period of a week. How many would have scores of 15 or larger?

A) 15
B) 100
C) 45
D) none of the other alternatives are correct.