Posted by **Debin** on Tuesday, December 4, 2012 at 6:08pm.

Consider the following test scores obtained by a class.

Test score 90 80 70 60 50

Frequency 1 4 11 6 2

Find the standard deviation (rounded to the nearest hundredth).

--------------------------------

I've posted this question earlier and I'm still getting the wrong answer.

I don't know from what point I messed up.....

this is what I did.

Mean:

90+320+770+360+100 / 24 = 68.33

Deviation

469.59+136.19+2.79+69.39+335.99 / 24= 42.25

then square root of 42.45 is 6.5

but my answer came wrong. please help!

I can't move on to my next homework question because I keep getting this wrong :(

## Answer this Question

## Related Questions

- Math - Consider the following test scores obtained by a class. Test score 90 80 ...
- Math - Consider the following test scores obtained by a class. Test score 90 80 ...
- statistics - the admissions policy at a certain university requires that ...
- statistics - the admissions policy at a certain university requires that ...
- Statistics - Suppose that two different tests A and B are to be given to a ...
- statistics - a math test has a mean of 43 and a standard deviation of 17.0. find...
- statistics - a math test has a mean of 43 and a standard deviation of 17.0. find...
- college, statistics - a math test has a mean of 43 and a standard deviation 0f ...
- Stats - A Math test has a mean of 51 and standard deviation of 5.0. Find the ...
- math - Statistics: Analyze student exam scores Students were given an exam with ...