Question

Find the mean and standard deviation of the following data: 5, 6, 7, 8, 9 Based...

Find the mean and standard deviation of the following data:

5, 6, 7, 8, 9

Based on these results, check whether the value of 10 unusual?

Homework Answers

Answer #1

Following table shows the calculations;

X (X-mean)^2
5 4
6 1
7 0
8 1
9 4
Total 35 10

Sample size: n=5

The mean is:

The standard deviation is:

The data values that are within 2 standard deviations of mean considered as usual data values. The usual range of values is:

Since 10 lies in the above range so it is not unusual.

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