Mathematics

Mathematics, 23.07.2019 04:30, haydonmetzger

Suppose that the life expectancy of a certain brand of nondefective light bulbs is normally distributed, with a mean life of 1900 hr and a standard deviation of 100 hr. if 40 comma 000 of these bulbs are produced, how many can be expected to last at least 1900 hr?

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Physics, 24.06.2019 00:00, hdhdhd49jdhd

Suppose that the life expectancy of a certain brand of nondefective light bulbs is normally distributed, with a mean life of 1100 hr and a standard deviation of 100 hr. if 80 comma 000 of these bulbs are produced, how many can be expected to last at least 1100 hr

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Mathematics, 13.07.2019 06:30, Asantetaedog8934

The mean life of a particular brand of light bulb is 1200 hours. if you know that at about 95% of this brand of bulbs will last between 1100 and 1300 hours, then what is the standard deviation of the light bulbs' life?

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Mathematics, 12.10.2019 12:10, nicolescaggs

Construct a 99% confidence interval for life expectancy of a new ge light bulb. 64 bulbs are randomly selected and a mean of 750 hours and a standard deviation of 20 hours is found. assume the distribution of life expectancy is normally distributed.

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