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Suppose the scores on a trivia quiz are normally distributed with a mean of 80 and a standard deviation of 5.

Which group describes 16% of the population of trivia quiz scores?

 

scores below 70

scores below 75

scores above 83

scores above 90

 Apr 22, 2021
 #1
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Look for z - score corresponding to    .1600    ( or approximately   I find   - .99  ) 

    How many Standard Deviations is this ?  (.99)         multiply the S.D. * 5    and subtract from 80 to find the score ...   can you finish...?

 Apr 22, 2021
 #2
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so it would be scores below 75?

Guest Apr 22, 2021

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