Question
Asked May 23, 2019
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Assume that a populatio of thousands of people whose responses were used to develop the anxiety test had scores that were normally distributed with m=30 and sd =10. What proportion of people in this population would have anxiety scores within each of the followin ranges of scores?

(a) below 20

(b) above 30 

(c) Between 10 and 50

Either below 10 or above 50

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Expert Answer

Step 1

Hey, since there multiple subparts posted, we will answer first three subparts. If you want any specific part to be answered then please submit that question only or specify the problem in your message.

Let X be the anxiety score in a test. X follows normal distribution that has mean µ = 30 and the standard deviation σ = 10.

Step 2

(a)

The proportion of people in this population would have anxiety scores are below 20 is calculated below:

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Step 3

(b)

The proportion of people in this population would have ...

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