Question

The average production cost for major movies is 69 million dollars and the standard deviation is 19 million dollars. Assume the production cost distribution is normal. Suppose that 8 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. What is the distribution of X ? X ~ N( , ) What is the distribution of ¯ x ? ¯ x ~ N( , ) For a single randomly selected movie, find the probability that this movie's production cost is between 63 and 65 million dollars. For the group of 8 movies, find the probability that the average production cost is between 63 and 65 million dollars. For part d), is the assumption of normal necessary? NoYes

Answer 1

Answer : No

For part d), is the assumption of normal is not necessary