Question 1206898
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The scores on a psychology exam were normally distributed with a mean of 52 
and a standard deviation of 9. About what percentage of scores were less than 43​? 
Use the​ 68-95-99.7 rule.
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Notice that in this problem the score of 43 is one standard deviation from the mean of 52.


So, using the empirical rule, the percentage of scores that are less than 43 is

    {{{(1-0.68)/2}}} = {{{0.32/2}}} = 0.16,  or  16%.    <U>ANSWER</U>
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Solved.