8. A phone maker claims that its phones’ batteries last for 13.22 hours on average with...
8. A phone maker claims that its phones’ batteries last for 13.22 hours on average with standard usage with a standard deviation of 0.57 hours.
(a) If we accept that claim, what is the probability that a battery lasts between 12 and 14 hours?
(b) Find the 65th percentile for the battery lives- that is, a time for which 65% of the
batteries last less than that time.
(c) The company has just tested 29 devices. Find the probability that the mean battery life of the 29 phones is less than 13.5 hours
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8. A phone maker claims that its phones’ batteries last for
13.22 hours on average with...
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A company that produces cell phones claims its standard phone battery lasts longer on average than...
A company that produces cell phones claims its standard phone battery lasts longer on average than other batteries in the market. To support this claim, the company publishes an ad reporting the results of a recent experiment showing that under normal usage, their batteries last at least 35 hours. To investigate this claim, a consumer advocacy group asked the company for the raw data, which are shown to the right. Find a 95 % confidence interval and state your conclusion....
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A company that produces cell phones claims its standard phone battery lasts longer on average than...
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(8) 3. The time a cell phone lasts until it needs to be recharged is normally...
(8) 3. The time a cell phone lasts until it needs to be recharged is normally distributed with a mean of 14 hours and a standard deviation of 3 hours. a) You have to have your cell phone work for 10 hours as you are going on a hike. What is the probability the cell phone will not make the 10 hours necessary? (in other words what % cell phones last 10 hours or less before needing to be recharged)?...
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