Question 896211
A school is sending 11 children to a camp. If 20% of the children in the school are first graders, and the 8 children are selected at random, what is the mean and variance of the number of first graders chosen?
--------------------------
Binomial Problem:
mean = np = 11*0.2 = 2.2
variance = pq/n = (0.2*0.8)/8 = 0.16/8 = 0.2
-----------------------------
Cheers,
Stan H.
----------------