Question

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.

Answer 1

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.

Answer 2

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.

Answer 3

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