Please don't double post.
I'm not sure I understand this problem based on what I know of variance. Can someone help?
Suppose that 85% of all households bought in the last 4 months a product made by the Proctor & Gamble Corporation. If 386 households are selected at random, what is the variance of the number of households that bought in the last 4 months a product made by the Proctor & Gamble Corporation?