The estimated distribution (in millions) of the population by age in a certain country for the I Under 4 years: 245 year 2015 is shown in the pie chart. Make a frequency distribution for the data. Then use I 544 years: 405 the table to estimate the sample mean and the sample standard deviation of the data set. III 1549 years: 213 Use 70 as the midpoint for "65 years and over." CI 20-24 years: 24.7 I 25-34 years: 41.6 I 35-44 years: 38.4 I 45-64 years: 79.9 I 65 years and over: 55.5 .m- The sample mean is )_( = '1. (Round to two decimal places as needed.)