An automobile service facility specializing in engine tune-ups knows that 45% of all tune-ups are done on four cylinder automobiles, 40% on six-cylinder automobiles, and 15% on eight-cylinder automobiles. Let number of cylinders on the next car to be tuned Required:
a. What is the pmf of X?
b. Draw both a line graph and a probability histogram for the pmf of part (a).
c. What is the probability that the next car tuned has at least six cylinders? More than six cylinders?