A department store has daily mean sales of $ 28,372.72. The standard deviation of sales is $2000. On Tuesday, the store sold $34,885.21 worth of goods. Find Tuesday's z score. Was Tuesday a significantly good day?
A) 3.26, yes
B) 3.42, no
C) 2.61, no
D) 3.57, yes

Question

Quizplus · Accepted Answer

The z-score is calculated as (34885.21 - 28372.72) / 2000 = 3.26. A z-score of 3.26 indicates that Tuesday's sales were significantly higher than the mean.

A Department Store Has Daily Mean Sales of $ 28,372