7,5,a,8,1,a,4,6,b have a mean of 5 and a variance of three whole seven over nine. Calculate the value of a and b such that a, b is an element of Z+.

Vinay constructed this spinner based on the population of teachers at his school according to vinays model what is the probability that he will have a male history teacher two years in a row

Can some one explain this i got sent this. is this a threat i’m scared

Evaluate the function , when d = {9, 15, 30}. r = {5, 7, 12} r = {6, 10, 15} r = {6, 10, 20} r = {5, 12, 20}