# Chapter 11 Data Analysis and Statistics - Extension - Approximate Binomial Distributions and Test Hypotheses - Practice - Page 765: 2

3.1

#### Work Step by Step

Using the given equations, we find: $$\bar{x}=np=(40)(.6)=24$$ AND $$\sigma = \sqrt{np(1-p)}= \sqrt{24(1-.6)}=3.1$$

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