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August 30, 2014

Homework Help: statistics

Posted by Karen on Monday, May 9, 2011 at 11:19am.

After years of data collection by college students, it has been determined that the distribution of course grades in Ms. Greenís Statistic II class follows a normal distribution with a mean of 62 and a standard deviation of 14.


(a) A student will pass Ms. Greenís course if he or she receives a course grade of 70 or higher. A current student in Ms Greenís class is chosen at random. What is the probability that the student will NOT receive a passing grade in Ms. Greenís class?


(b) What is the probability of a student receiving a ďBĒ (i.e. a course grade greater than or equal to 80, but less than 90) in Ms. Greenís class?


(c) What range of course grade values would be considered outliers for Ms. Greenís class?

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