Name Show your work. Unsupported numerical answers will not receive credit 1. Su

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Name Show your work. Unsupported numerical answers will not receive credit 1. Suppose the mean income of firms in the industry for a year is 65 million dollars with a standard deviation of 1 million Exam 3 MAT 205 Fall 17 dollars. If incomes for the industry are distributed normally, what is the probability that a randomly selected firm will carn less than 66 million dollars? (Round your answer to 4 decimal places) (4 Points) 2. The mean number of hours watching TV per week for a sample of 153 teenagers is 27. If the margin of error for the population mean with a 98% confidence interval is 1.2, construct a 98% confidence interval for the mean number of hours watching TV per week for all tecnagers (4 Points) An economist wants to estimate the mean per capita income (in that the mean is 34.8. Assume the standard deviation is known to be 9How large of a sample would be estimate the mean per capita income (in thousands of dollars) at the 80% confidence level with an error of at thousands of dollars? (Round your answer up to the next integer) thousands of dollars) in a major city in Texas. He believes most 0.42 (4 Points)

Explanation / Answer

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1) Mean = 65

SD = 1

x = 66

z = (66 - 65)/1

z = 1

P(z < 1) = 0.8413

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