Question

8) The table shows the number of years 15 employees worked for Anderson 5 School District before retiring. Findthe population mean. What population proportion have more than 15 years?

Answer 1

To find the mean, first sum all values of the years workes (all values of the second column):

8 + 13 + 15 + 3 + 13 + 28 + 4 + 12 + 4 + 26 + 29 + 3 + 10 + 3 + 17 = 178

next, to find the mean, divide the previous result by the total number of employees, which are 15.

mean = 178/15 = 11.86

Hence, the mean population is 11.86

To determine the population proportion for more than 15 years, take into account the number of employees with more than 15 years. You can notice from the table that there are 4 employees with more than 15 years.

The proportion is the quotient between 4 and the total number of employees 15:

propotion = 4/15