15) For a standard normal distribution, what is the probability of obtaining azvalue between?1.2and?0.27?

0.1721

0.2785

0.7215

0.8279

7)

Delta Airlines quotes a flight time of 2 hours, 6 minutes for a particular flight. Suppose we believe that actual flight times are uniformly distributed between 2 hours and 2 hours, 48 minutes. (a) Show the graph of the probability density function for flight time. f( x) f(x) f(x) f(x) 16 1 1 1 1 1 24 24 24 24 1 1 1 48 48 48 48 X X X X BOL 120 132 144 Flight Time in Minutes 156 168 108 120 132 144 Flight Time in Minutes 156 168 108 120 132 144 Flight Time in Minutes 156 168 120 132 144 Flight Time in Minutes 156 168 O (b) What is the probability that the flight will be no more than 6 minutes late? (c) What is the probability that the flight will be more than 12 minutes late? (d) What is the expected flight time, in minutes? min