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2. (25 points) A certain brand of batteries has a lifetime that has a normal distribution with a mean of 3,750 hours and
Posted: Wed May 11, 2022 7:04 am
by answerhappygod
- 2 25 Points A Certain Brand Of Batteries Has A Lifetime That Has A Normal Distribution With A Mean Of 3 750 Hours And 1 (30.71 KiB) Viewed 43 times
2. (25 points) A certain brand of batteries has a lifetime that has a normal distribution with a mean of 3,750 hours and a standard deviation of 300 hours. a. (10 points) What proportion of these batteries will last between 3,800 and 4,200 hours? b. (10 points) What proportion of these batteries will last less than 3,650 hours? C. (5 points) What lifetime should the manufacturer advertise for these batteries in order that only 4% of the lamps will wear out longer than the advertised lifetime? (What value of z corresponds to an area under the curve of 4%?)