Chapter 7 - Section 7.2 - Mean and Standard Deviation of x - Exercises - Page 283: 7.13

$\mu$ =125, σ =36 $\sigma_{\bar{x}\ }$ =3.6 3.6= $\frac{36}{\sqrt n}$ , n = 100. B. $\mu$ =125, σ =36 $\sigma_{\bar{x}\ }$=2.25 2.25= $\frac{36}{\sqrt n}$ , n = 256.

$\mu$ =125, σ =36 $\sigma_{\bar{x}\ }$ =3.6 3.6= $\frac{36}{\sqrt n}$ , n = 100. B. $\mu$ =125, σ =36 $\sigma_{\bar{x}\ }$=2.25 2.25= $\frac{36}{\sqrt n}$ , n = 256.