If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

# Mean and standard deviation of sample proportions

AP.STATS: UNC‑3 (EU), UNC‑3.M (LO), UNC‑3.M.1 (EK)

## Problem

An organization is considering having a "Bring your pet to work" day. The administration takes an
SRS
of 35 of their employees and finds that 20, percent of those sampled are allergic to pets. Administration is considering taking more samples like this. Suppose that of all 500 employees of the organization, it's actually 10, percent that are allergic.
Let p, with, hat, on top represent the proportion of a sample of 35 employees that are allergic to pets.
What are the mean and standard deviation of the sampling distribution of p, with, hat, on top?