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## Homework Statement

A sample survey interviews an SRS of 267 college women. Suppose (as is roughly true) that 70% of all college women have been on a diet within the past 12 months. Use a Normal approximation to find the probability that 75% or more of the women in the sample have been on a diet.

## Homework Equations

Zscore=(x-mu)/(sd/n)

## The Attempt at a Solution

I could do this if I knew how to find the standard deviation, but I don't..

Any help would be great, thanks!