any help would be great :)

V At one university, the mean distance commuted to campus by students is 19.0 miles, with a standard deviation of 4.3 miles. Suppose that the commute distances are normally distributed. Complete the following statements. (a) Approximately 7 of the students have commute distances between 10.4 miles and 27.6 miles. (b) Approximately 99.7% of the students have commute distances between [1 miles and I] miles