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Category > Statistics Posted 02 Aug 2017 My Price 5.00

average fuel efficiency of U.S

The average fuel efficiency of U.S. light vehicles (cars, SUVs, minivans, vans, and light trucks) for 2005 was 21 mpg. If the standard deviation of the population was 2.9 and the gas ratings were normally distributed, what is the probability that the mean mpg for a random sample of 25 light vehicles is under 20? Between 20 and 25?

Answers

Alpha Geek
(8)
Status NEW Posted 02 Aug 2017 02:08 PM My Price 5.00

We -----------kno-----------w t-----------hat----------- µ----------- = -----------21,----------- s -----------= 2-----------.9 -----------and----------- n -----------= 2-----------5 T-----------he -----------res-----------pec-----------tiv-----------e Z------------sc-----------ore----------- wi-----------th -----------X-b-----------ar -----------= 2-----------0 i-----------s Z----------- = -----------(X------------bar----------- - -----------µ)-----------/ (-----------s/v-----------n) -----------Z =----------- (2-----------0 â-----------€“ -----------21)-----------/ (-----------2.9-----------/v2-----------5) -----------Z =----------- -1-----------

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