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Chapter 7: Q.19 (page 428)

Find the sum with a z鈥搒core of -2.5.

Short Answer

Expert verified

The sum with az-score of-2.5is鈭�X=3903.5.

Step by step solution

01

Given Information

A sample size (n)=100.

The mean of population 渭X=39.01.

z=-2.5.

A standard deviation 蟽X=0.5.

02

Explanation

To find the sum with a z-score of -2.5:

鈭�X=(n)渭X+(z)(n)蟽X

Calculating, we have:

鈭�X=100脳39.01-2.5脳100脳0.5

鈭�X=3888.5

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