SOLUTION: Mean score of an statistic exam is 75 and normally distributed. The probability between 55 and 60 is 4.41% and the probability of students scoring more, 90 is 6.61%.
What is the p
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Question 1083079: Mean score of an statistic exam is 75 and normally distributed. The probability between 55 and 60 is 4.41% and the probability of students scoring more, 90 is 6.61%.
What is the probability of students scoring between 60 and 95 ?
Answer by mathmate(429) (Show Source): You can put this solution on YOUR website!
For this particular problem, it can be solved quickly, as follows:
=
= ..... recall that mean=75, and normal distr. is symm about mean
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=
=
=
A more general way is to solve for the standard deviation, and solve accordingly. Standard deviation will be found to be 9.9639.
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