A market-research organization wants to estimate the mean amounts of time in a week that television sets are in use in households in a city that contains 65 precincts. A simple random sample of 10 precincts was selected, and every household in each sampled precinct was questioned. The following results were obtained:
a. Find a point estimate of the population mean amount of time that televisions are in use in this city.
b. Find a 90% confidence interval for the population mean.

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Sampled Precinct Number of Households Mean Time Television in Use (Hours) 29.6 18.4 32.7 26.3 22.4 31.6 19.7 23.8 25.4 24.1 18 41 38 36 30 10