Need help with D 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....

Need help with D

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?
________________________
c. What is the probability that a randomly chosen test score is between 1250 feet and 2000?
________________________
d. Find the range of test scores which account for the lowest 30% of the scores.