Homework Answers
Ans:
| midpoint,m | frequency,f | m*f | (m-79.406)^2*f |
| 54.5 | 5 | 272.5 | 3101.55 |
| 64.5 | 315 | 20317.5 | 69989.77 |
| 74.5 | 1452 | 108174 | 34948.38 |
| 84.5 | 1519 | 128355.5 | 39415.82 |
| 94.5 | 267 | 25231.5 | 60830.06 |
| 104.5 | 7 | 731.5 | 4407.95 |
| Total | 3565 | 283082.5 | 212693.52 |
mean=283082.5/3565=79.4
standard deviation=sqrt(212693.52/3565)=7.724
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