At one university, the mean distance commuted to campus by students is 17.0 miles, with a standard deviation of 4.2 miles. Suppose that the commute distances are normally distributed. Complete the following statements.
(a) Approximately 95 % of the students have commute distances between
empty input box miles
and
empty input box miles
.
(b) Approximately
of the students have commute distances between 12.8 miles and 21.2 miles.
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