The following relative frequency distribution was constructedfrom a population of 550. Calculate the population mean, thepopulation variance, and the population standard deviation.(Negative values should be indicated by a minus sign. Roundintermediate calculations to at least 4 decimal places and finalanswers to 2 decimal places.)
| Class | RelativeFrequency |
| ?20 up to ?10 | 0.30 |
| ?10 up to 0 | 0.22 |
| 0 up to 10 | 0.32 |
| 10 up to 20 | 0.16 |
Population mean-1.60 (correct)
Population variance 115.02 (Its marking this one wrong) Population standard deviation 10.72 (correct) |
