The following relative frequency distribution was constructed from a population of 250. Calculate the population mean, the population variance, and the population standard deviation.(Round your intermediate calculations to 4 decimal places and final answers to 2 decimal places.)

Class	Relative Frequency
20 up to 10	0.30
10 up to 0	0.24
0 up to 10	0.34
10 up to 20	0.12

Population mean
Population variance
Populationstandard deviation