A statistical analysis of 1,000 long-distance telephone calls made from the headquarters of the bricks and clicks computer corporation indicates that the length of these calls is normally distributed, with u = 240 seconds and o= 40 seconds.

show complete solution with curve/parabola

a. what is the probability that a call lasted less than 180 seconds? with curve/parabola.

b. what is the probability that a call lasted less between 180 and 300 seconds? with curve/parabola.

c. what is the probability that a call lasted less between 110 and 180 seconds? with curve/parabola.

d. 1% of all call will last less than how many seconds? with curve/parabola