After measuring the duration of many telephone calls, the telephone company found their data was well-approximated by the density functionp(x) =0.6e^0.6x, wherexis the duration of a call, in minutes.

(a) What percentage of calls last between4and5minutes?

% (nearest tenth)

(b) What percentage of calls last4minutes or less?

% (nearest tenth)

(c) What percentage of calls last4minutes or more?

% (nearest tenth)

(d) Express the cumulative distribution function in the formP(x) =

	x< 0
	x2