Posted by **please help in panic mode-mary** on Saturday, October 16, 2010 at 12:21am.

find the range,standard deviation, and variance for the following sample date:

98,2,53,61,15,87,63,63,91,29,96,79,93,40,5,62

*please show all calculations for confirmation. thank you very much. i just want to double myself. thank you.

- Name suggestion -
**Writeacher**, Saturday, October 16, 2010 at 7:28am
Mary,

If you want people to take you seriously, it would undoubtedly be a good idea to change your screen name to just Mary. The longer you have this "panic mode" thing showing up, the less seriously people will take your posts. It's a form of crying wolf.

- statistics -
**PsyDAG**, Saturday, October 16, 2010 at 11:35am
Range = highest score - lowest score

Find the mean first = sum of scores/number of scores

Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.

Standard deviation = square root of variance

I'll let you do the calculations.

- statistics -
**drwls**, Saturday, October 16, 2010 at 11:36am
There is a tool for that sort of calculation at :

http://easycalculation.com/statistics/standard-deviation.php

The range is obviously 2 to 98

The mean is 58.56

The standard deviation is 32.35

The variance is the square of that

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