Introductory Statistics 9th Edition

Published by Wiley
ISBN 10: 1-11905-571-7
ISBN 13: 978-1-11905-571-6

Chapter 3 - Section 3.3 - Mean, Variance, and Standard Deviation for Grouped Data - Exercises - Page 102: 3.49

Answer

Mean = 11.24 Variance = 36.7499 Standard Deviation = 6.0622

Work Step by Step

$Mean = 1124\div100 = 11.24$ $Variance =σ^2 =(∑m^2 f-([(∑mf)]^2/N))/(N-1) = \frac{16272- (1263376\div100)}{99} =(16272-12633.76)\div99 =36.7499$ $Standard Deviation = \sqrt 36.7499= 6.0622$
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