SOLUTION: The scores on a psychology exam were normally distributed with a mean of 51 and a standard deviation of 6. About what percentage of scores were less than 33 ?

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Question 1155573: The scores on a psychology exam were normally distributed with a mean of 51 and a standard deviation of 6. About what percentage of scores were less than 33 ?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
z=(x-mean)/sd
=(33-51)/6
=-3
probability of z < -3 is about 0.0015 or about 0.15%.