The distance between store outlets in a chain of stores in a large metropolitan city is normally distributed with an average of 50km and a standard deviation of 5km.What is the probability of finding a store no less than 55km away?
A)0.1668
B)0.2443
C)0.1254
D)0.8727
E)0.1587

Question

Quizplus · Accepted Answer

The Z-score for 55km is (55-50)/5 = 1. The probability of a Z-score being less than 1 is 0.8413, so the probability of being no less than 55km is 1 - 0.8413 = 0.1587.

The Distance Between Store Outlets in a Chain of Stores