A) False B) True SHORT ANSWER. Write the word or phrase that best completes each
ID: 3155974 • Letter: A
Question
A) False B) True SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 14) 14) Approximately- % of the area under the normal curve is between -2 and + 2· 15) 15) The tread life of a particular brand of tire is a random variable best described by a normal distribution with a mean of 60,000 miles and a standard deviation of 2800 miles. What warranty should the company use if they want 96% of the tires to outlast the warranty? 16) In a recent survey, 60% of the community favored building a health center in their neighborhood. If 14 citizens are chosen, find the probability that exactly 10 of them favor the building of the health center. 17) A local bakery has determined a probability distribution for the number of cheesecakes that they sell in a given day. The distribution is as follows: Number sold in a day! 0 5 10 15 20 Prob (Number sold 0.07 024 0.1 0.17 0.42 Find the number of cheesecakes that this local bakery expects to sell in a day. C-3
Explanation / Answer
14.
95% [ANSWER]
This is by 68-95-99.7 rule, between two standard deviations from the mean is 95% of the data.
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15.
First, we get the z score from the given left tailed area. As
Left tailed area = 1 - 0.96 = 0.04
Then, using table or technology,
z = -1.750686071
As x = u + z * s,
where
u = mean = 60000
z = the critical z score = -1.750686071
s = standard deviation = 2800
Then
x = critical value = 55098.079 [ANSWER]
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