The average number of dropouts for a school district has been 305 per year, with a standard deviation of 50. What is the probability that next year the number of dropouts will be
a. less than 250?________
b. less than 300? ________
c. more than 350? ________
d. more than 400? ________
e. between 250 and 350? ________
f. between 300 and 350? ________
g. between 350 and 375? ________