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Genrish500 [490]
3 years ago
13

Car Survey: In a survey of 2,400 people who owned a certain type of​ car, 1,680 said they would buy that type of car again. What

percent of the people surveyed were satisfied with the​ car?
Mathematics
1 answer:
Umnica [9.8K]3 years ago
5 0

Answer:

70 percent

Step-by-step explanation:

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According to the Sleep Foundation, the average night's sleep is 6.8 hours (Fortune, March 20, 2006). Assume the standard deviati
vivado [14]

Let X be the random variable for the time a given person from the population spends sleeping. With X\sim\mathcal N(6.8,0.4^2) we have

P(X>8)=P\left(\dfrac{X-6.8}{0.4}>\dfrac{8-6.8}{0.4}\right)=P(Z>3)\approx0.0013

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P(7

Rounded to the nearest whole number, that comes out to about 31%.

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