Introductory Statistics 9th Edition

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

Chapter 3 - Supplementary Exercises - Page 118: 3.85

Answer

mean = 5.08 variance = 6.8506 standard deviation = 2.6174 It is a sample statistic.

Work Step by Step

$mean =∑fx \div f = 254/50= 5.08$ $variance ={∑(fx^2) –[∑(fx)^2/N]}/(n-1)$ $= [1626- (64516/50)] / 49 $ $= 6.8506$ $standard \ deviation =\sqrt 6.8506 = 2.6174$
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