Male and female populations of tortoises under 80 years old are represented by age in the table below. Complete parts (a) through (d). Age 0-9 10-19 20-29 30-39 40-49 50-59 60-69 70-79 Males 12 12 18 20 25 21 18 15 Females 7 7 15 18 22 23 19 13 A (a) Approximate the population mean and standard deviation of age for males. μ= years (Round to two decimal places as needed.)

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