SOLUTION: The standardized mathematics scores of a certain school district are normally distributed with the mean of 500 and standard deviation 100. Find the probability that a score is less

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Question 330070: The standardized mathematics scores of a certain school district are normally distributed with the mean of 500 and standard deviation 100. Find the probability that a score is less than 300?
I have no idea where to start. a clue would be great. Have another homework question just like it.
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
a score of 300 is two standard deviations below the mean ___ z = -2

a z-score table will show that the probability of this is ___ .0228