Elementary Statistics (12th Edition)

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

Chapter 5 - Discrete Probability Distributions - Review - Chapter Quick Quiz - Page 236: 3



Work Step by Step

Out of 5 answers, the probability of guessing the correct one randomly is:$\frac{1}{5}=0.2$. n=100, therefore mean$=nā‹…p=100ā‹…0.2=20.$ Standard deviation: $\sqrt{n \cdot p \cdot (1-p)}=\sqrt{100\cdot 0.2 \cdot 0.8}=\sqrt {16}=4.$
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