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Joint probability distribution

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The U.S. Bureau of Labor Statistics collected data on the occupations of workers 25 to 64 years old. The following table shows the number of male and female workers (in millions) in each occupation category (Statistical Abstract of the United States: 2002)

(see chart in the attached file)

a. Develop a joint probability table
b. Determine the probability of a female worker being a manager or professional.
c. Determine the probability of a male worker being in precision production.
d. Determine if occupation is independent of gender. Justify the answer with a probability calculation

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Normal Distribution and Joint Probability Distribution

54. Suppose the sediment density (g/cm) of a randomly selected specimen from a certain region is normally distributed with mean 2.65 and standard deviation .85 (suggested in "Modeling Sediment and Water Column Interactions for Hydrophobic Pollutants," Water Research, 1984: 1169?1174).

a. If a random sample of 25 specimens is selected, what is the probability what is the probability that the sample average sediment density is at most 3.00? Between 2.65 and 3.00?

b. How large a sample size would be required to ensure the the first probability in part (a) is at least .99?

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