## Introductory Statistics 9th Edition

Mean = $752\div80 = 9.4$ Variance $=σ^2$ $=(∑m^2 f-([(∑mf)]^2/N))/N$ $= \frac{10048- (565504\div80)}{79}$ $= 37.7114$ Standard Deviation =$\sqrt 37.7114$ =6.141
Mean = $752\div80 = 9.4$ Variance $=σ^2$ $=(∑m^2 f-([(∑mf)]^2/N))/N$ $= \frac{10048- (565504\div80)}{79}$ $= 37.7114$ Standard Deviation =$\sqrt 37.7114$ =6.141