Chapter 3 - Section 3.3 - Mean, Variance, and Standard Deviation for Grouped Data - Exercises - Page 102: 3.50

Mean = 19.6667 Variance = 67.6979 Standard Deviation = 8.2279

Mean = $5900\div300 = 19.6667$ Variance $ =σ^2$ $=(∑m^2 f-([(∑mf)]^2/N))/(N-1)$ $= \frac{136275- (34810000\div300)}{299}$ $=(136275-116033.3333)\div299$ $=67.6979$ Standard Deviation =$ \sqrt 67.6979 = 8.2279$