Posted by **Sunshine** on Thursday, March 21, 2013 at 12:39am.

Scores on a visual perception test are normally distributed with a mean of 2020 and a standard deviation of 250.

a)If one subject is randomly selected and tested, find the probability of a score greater than 1800

b)if 50 subjects are randomly selected and tested fid the probability that the sample mean is between 2000 and 2100

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