The ages of Jeff's five cousins are listed below. 15|15|2o141o 1) Calculate the mean. = :1 2) Fill in the table below: Fill in the differences of each data value from the mean, then the squared differences. 2 a: I .u (a: - #1 1 15 6 14 1D i|_I i|_I '20 i|_I lg 3] Calculate the population standard deviation (0'). 2 1' o; _ a = w = |:' {Please round your answer to two decimal places}