Statistics- Normal Distribution, Probabilities, proportions

At a local high school, 1,000 juniors and seniors recently took an aptitude test. The results of the exam were normally distributed with a mean of 250 and a standard deviation of 15.
Find
a)% of students scoring less than 225
b)number of students that scored less than 180
c)probability of a student selected at random having scored between 210 and 250.

Given n = 1000
Population Mean = 250
Standard Deviation = 15
For X ...

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