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 one standard deviation of the mean? 52 - 55 51 - 57 48 - 60 45 - 63

Explanation:

Step1: Calculate lower - bound

$54−3 = 51$

Step2: Calculate upper - bound

$54 + 3=57$

Answer:

B. 51 - 57