Posted by **Debin** on Tuesday, December 4, 2012 at 9:59pm.

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).

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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 :(

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