Find the number of volunteers with ages less than 20 years. Find the number of volunteers with ages greater than 22 years. Find the actual age of Roland if 85.31% of the volunteers are younger а. b. с.

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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A group of 500 volunteers recorded an average age of 21.5 years and
standard deviation of 9.6 years. Assumed the distribution is normally
1.
distributed.
Find the number of volunteers with ages less than 20 years.
b. Find the number of volunteers with ages greater than 22 years.
Find the actual age of Roland if 85.31% of the volunteers are younger
а.
c.
than him.
d.
If 2.5% of the volunteers are older than Shirley how old is she?
Between what ages is the middle 40% of the volunteers?
е.
Transcribed Image Text:A group of 500 volunteers recorded an average age of 21.5 years and standard deviation of 9.6 years. Assumed the distribution is normally 1. distributed. Find the number of volunteers with ages less than 20 years. b. Find the number of volunteers with ages greater than 22 years. Find the actual age of Roland if 85.31% of the volunteers are younger а. c. than him. d. If 2.5% of the volunteers are older than Shirley how old is she? Between what ages is the middle 40% of the volunteers? е.
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