Suppose that the scores on and aptitude test are normally distributed with a mean of 1200 feet and a standard deviation of XXXXXXXXXXdecimal places) a. ?~?( ________, __________) b. What is the...

Suppose that the scores on and aptitude test are normally distributed with a mean of 1200 feet and a standard deviation of 50. (4 decimal places)
a. ?~?( ________, __________)
b. What is the probability that a randomly chosen test score is less than 1250?
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c. What is the probability that a randomly chosen test score is between 1250 feet and 2000?
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d. Find the range of test scores which account for the lowest 30% of the scores.
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