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Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
ISBN: 9781133956570

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Chapter
Section
BuyFindarrow_forward

Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
ISBN: 9781133956570
Textbook Problem

For a normal distribution, find the z-score location that divides the distribution as follows:

a.    Separate the top 20% from the rest.

b. Separate the top 60% from the rest.

c. Separate the middle 70% from the rest.

(a)

To determine

To find: The z-score location that divides the distribution as separate the top 20% from the rest.

Explanation

Given info:

The z-score separates top 20% from the rest.

Calculation:

Calculating the probability value by using the EXCEL procedure:

The formula is (=NORMSINV(probability)) to find the z-score separate the top 20% from the rest is as follows:

P(Z>z)=0.201P(Zz)=0.20P(Zz)=10

(b)

To determine

To find: The z-score location that divides the distribution as separate the top 60% from the rest.

(c)

To determine

To find: The z-score location that divides the distribution as separate the middle 70% from the rest.

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