## Answers

Following table shows the ordered data set, sum of data values and calculations for standard deviation:

So we have

1:

The sample mean is:

2:

There are 12 data values so median will be average of 6th and 7th data value. That is median will be

3:

4:

5:

6:

Since 12 * 0.25 = 3 so we need to trim 3 data from both sides of ordered data set. The new data set and sum of remaining data values is as follows:

So,

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