Question

given that a set of scores have a normal distribution, a mean of 54, and a standard deviation of 3: what is the range within two standard deviations of the mean? 52 - 55 51 - 57 48 - 60 45 - 63

Explanation:

Step1: Calculate lower - bound

$54 - 2\times3=48$

Step2: Calculate upper - bound

$54 + 2\times3=60$

Answer:

C. 48-60