The average production cost for major movies is 66 million dollars and the standard deviation is 19 million dollars. Assume the production cost distribution is normal. Suppose that 12 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 XX? XX ~ N(,)What is the distribution of ¯xx¯? ¯xx¯ ~ N(,)For a single randomly selected movie, find the probability that this movie's production cost is between 63 and 68 million dollars. For the group of 12 movies, find the probability that the average production cost is between 63 and 68 million dollars. For part d), is the assumption of normal necessary? YesNo

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Asked Feb 15, 2020
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The average production cost for major movies is 66 million dollars and the standard deviation is 19 million dollars. Assume the production cost distribution is normal. Suppose that 12 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.

  1. What is the distribution of XX? XX ~ N(,)
  2. What is the distribution of ¯xx¯? ¯xx¯ ~ N(,)
  3. For a single randomly selected movie, find the probability that this movie's production cost is between 63 and 68 million dollars. 
  4. For the group of 12 movies, find the probability that the average production cost is between 63 and 68 million dollars. 
  5. For part d), is the assumption of normal necessary? YesNo
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Expert Answer

Step 1

1.

The distribution of X is, X~N($66 million, $19 million).

Step 2

Statistics homework question answer, step 2, image 1

Step 3

3.

The probability that one randomly selected movie's production cost is between 63 and 68 million dollars is,

Statistics homework question answer, step 3, image 1

Thus, the probability that one randomly selected movie's production cost is between 63 and 68 million dollars is 0.1046.

...

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