average production cost for major movies is 68 million dollars and the standard deviation is 23 million
dollars. Assume the production cost distribution is normal. Suppose that 18 randomly selected major
movies are researched. Answer the following questions. Give your answers in millions of dollars, not
dollars. Round all answers to 4 decimal places where possible.
a. What is the distribution of X? X-N(
b. What is the distribution of ? I-N
c. For a single randomly selected movie, find the probability that this movie's production cost is
between 69 and 73 million dollars.
d. For the group of 18 movies, find the probability that the average production cost is between 69 and
73 million dollars.
e. For part d), is the assumption of normal necessary? O Yes No
