Question

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?3.42, no3.57, yes3.26, yes2.61, no

Answer 1

Answer: 3.26, yes

Step-by-step explanation:

The formula for calculating the z score is expressed as

z = (x - μ)/σ

where

x represents sample mean

μ represents population mean

σ represents population standard deviation

From the information given,

x = 34,885.21

μ = 28,372.72

σ = 2000

By substituting these values into the formula,

z = (34,885.21 - 28,372.72)/2000

z = 3.26

Tuesday's z score was 3.26