Question

On Monday, Tuesday, and Wednesday, you drink one or more cups of coffee while working on...

On Monday, Tuesday, and Wednesday, you drink one or more cups of coffee while working on your statistics class from home. This past week you had 74, 85, and 94 cups. Find the standard deviation for the number of cups for the past three days, and round your answer to 1 decimal place if needed.

Math   Statistics-And-Probability   
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Homework Answers

Answer #1

Solution:

Given that,

74, 85, 94

The mean of sample is   

x/n =  (74+85+94 / 3)

= 84.33

The sample mean is 84.33

Sample standard deviation is s

s = 1/(n-1)(x - )2

=  1/2(74- 84.33 )2+ (85 - 84.33 )2+ (94- 84.33 )2

= 100.3333333333

=10.017

The sample standard deviation is 10.0

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