Using the following data, calculate the mean absolute deviation: 7 2 8 5 9 9 5 6 8 1

What is the mean absolute deviation for these data?
2.2
6
6.5
8

Assume that a population of 50 individuals has the following numbers of genotypes for a gene with two alleles, b and b: bb = 30, bb = 10, and bb = 10. calculate the frequencies of the two alleles in the population’s gene pool.

Can someone me with this problem . show your work .

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?