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An engineer measure 4 different pressures, 91, 99, 91 and 95 psi. What is the standard...

An engineer measure 4 different pressures, 91, 99, 91 and 95 psi. What is the standard deviation of these measurments?

Math   Statistics-And-Probability   
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Answer #1

The sample size is n=4. The provided sample data along with the data required to compute the sample mean and sample variance are shown in the table below:

X X2
91 8281
99 9801
91 8281
95 9025
Sum = 376 35388

The sample variance is

Therefore, the sample standard deviation s is

Let me know in the comments if anything is not clear. I will reply ASAP! Please do upvote if satisfied!

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