9.22 A sample of 10 tekvision tubes produced by a company showed a mean lifetime of 1200 hours (h) and a standard deviation of 100 h. Estimate (a) the mean and (b) the standard deviation of the...

9.22 A sample of 10 television tubes produced by a company showed a mean lifetime of 1200 hours (h) and a
standard deviation of 100 h. Estimate (a) the mean and (b) the standard deviation of the population of all
television tubes produced by this company.

Extracted text: 9.22 A sample of 10 tekvision tubes produced by a company showed a mean lifetime of 1200 hours (h) and a standard deviation of 100 h. Estimate (a) the mean and (b) the standard deviation of the population of all television tubes produced by this company.