Male and female populations of humpback whaleshumpback whales under 80 years old are represented by age in the table below.

Age Males Females

0-9 9 8

10-19 10 9

20-29 12 12

30-39 16 20

40-49 22 20

50-59 23 22

60-69 15 15

70-79 13 12

a) Approximate the population mean and standard deviation of age for males. round to two decimal places as needed.)