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 am doing estimating Standard deviation of grouped data.
I have done all the sum freg 60/ midpoint 2580/ x bar is 43 for all/ and total with x bar is 10260. Can you explain how to get the variance and sq root from these. I know that you have to fregx(mid-xbar)square2 and divide by 60-1. What do I do after that to find variance and sq root. Thank you
1 answer