Elementary Statistics (12th Edition)

Published by Pearson
ISBN 10: 0321836960
ISBN 13: 978-0-32183-696-0

Chapter 6 - Normal Probability Distributions - Review - Review Exercises - Page 316: 4


a) Normal b) $21.1$ c) $0.57$

Work Step by Step

a) Using our knowledge of distributions, we can see that this distribution is bell-shaped, or normal. b) The mean of all of the sample means is equal to the mean given in the question, which is $21.1$. c) We find that the standard deviation is: $\frac{5.1}{\sqrt{80}}=0.57$
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