Posted by **sarah** on Sunday, December 8, 2013 at 3:29pm.

find the standard deviation for the following: 8,5, 12, 8, 9, 15, 21, 16, 3. There is a formula but our teacher wants us to do it a specific way.

For example, 47, 41, 32, 53, 57. First you find the mean, which is 46 and then subtract it with each number in the set so you get 1, -5, -14, 7, 11. then you square each # to get 1, 25, 196, 49, 121. then add all the numbers to get 392 & you do 392/n-1 (n being how many #s there are in the set) so 392/5-1 = 98 then you square root 98 & the standard deviation is 9.9.

For 8, 5, 12, 8, 9, 15, 21, 16, 3 the standard deviation is 5.73973 but when i tried the process i get a completely different answer. First the i found the mean, which is 10.77777778. (97/9) but after this i started messing up, help?

## Answer this Question

## Related Questions

- math - find the standard deviation for the following: 8,5, 12, 8, 9, 15, 21, 16...
- Statistics - Given that x is a normally distributed random variable with a mean ...
- Math - Roughly speaking, the standard deviation indicates how far, on average, ...
- Math: Statistics - My homework has a list of numbers and I'm working with ...
- math - hi i need help calculating the standard error using the central limit ...
- stats - Why must you square the deviation scores when computing a standard ...
- MATH - A mean score on a standardized test is 50 with a standard deviation of 10...
- Physical Fitness - We have an assignment and this is all about the physical ...
- Statistics - hi i need help calculating the standard error using the central ...
- Statistics - data from sample of 400 cases, variable has 95% confidence interval...

More Related Questions