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probability problem please !!?
The amount of time devoted to studying statistics each week by students who achieve a grade A on the course is normally distributed with mean of 7.5 hrs and standard deviation of 2.1 hrs.
What is the proportion of A students for more than 10hrs per week ?
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- ?Lv 76 years agoFavorite Answer
The z-score you need is (10 - 7.5)/2.1 = 1.19
From a standard table, we get P(x > 10) = 0.117,
or about 11.7%
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