Suppose a certain population of observations is normally distributed. What percentage of the observations in the population

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Suppose a certain population of observations is normally distributed. What percentage of the observations in the population
(a) Are within ± 1.5 standard deviations of the mean?
(b) Are more than 2.5 standard deviations above the mean?
(c) Are more than 3.5 standard deviations away-from (above or below) the mean?
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Statistics For The Life Sciences

ISBN: 9780321989581

5th Edition

Authors: Myra Samuels, Jeffrey Witmer, Andrew Schaffner

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