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Statistics - Probability

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1. The salaries (in thousands of dollars) for a sample of 13 employees of a firm are: 26.5, 23.5, 29.7, 24.8, 21.1, 24.3, 20.4, 22.7, 27.2, 23.7, 24.1, 24.8 and 28.2. Compute the variances.

2. New York City is estimated to have 21 percent of the homes with TV sets served by cable TV. If a random sample of four is taken from these homes find the probability distribution of x where x is the number of TV homes in the sample having Cable TV.

What is the probability that at least one TV home in the sample is served by cable?

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