A statistical analysis of1,000 long-distance telephone calls made by a company indicates that the length of these calls is normallydistributed, with =240 seconds and =40 seconds. Complete parts(a) through(d).

a. What is the probability that a call lasted less than 160 seconds?

The probability that a call lasted less than 160 seconds is

( )

(Round to four decimal places asneeded.)

b. What is the probability that a call lasted between 160 and 300 seconds?

The probability that a call lasted between 160 and 300 seconds is

( )

(Round to four decimal places asneeded.)

c. What is the probability that a call lasted between 120 and 160 seconds?

The probability that a call lasted between 120 and 160 seconds is

( )

.

(Round to four decimal places asneeded.)

d. What is the length of a call if only 1% of all calls areshorter?

1% of the calls are shorter than ( ) seconds.

(Round to two decimal places asneeded.)