Question

A department​ store, on​ average, has daily sales of ​$28 comma 286.28. The standard deviation of sales is ​$1 comma 500. On​ Tuesday, the store sold $ 34 comma 924.62 worth of goods. Find​ Tuesday's z score. Was Tuesday an unusually good​ day? Round results to the nearest hundredth.

Answer 1

z-score = 4.43,

It is a Good day

Explanation:

The provided information is:

Mean = $28,286.28

Standard deviation = $1,500

Let x be the sell of department store on Tuesday.

Then, x = $34,924.62

The z-score is define as:

`z=(x-\mu)/(\sigma)\\\\=(34924.62-28286.28)/(1500)\\\\=4.43`

Thus, the Tuesday's z-score is 4.43. So this is usually good day.