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Long Life Battery Company makes car batteries. After years of product testing, the company knows their batteries follow a normal distribution with a mean lifespan of 45 months and a standard deviation of 7 months. The company guarantees that batteries with a short lifespan will be replaced free of charge. If Long Life does not want to make refunds for more than 10% of its batteries under the full-refund guarantee policy, for how long should the company guarantee the batteries?
What equation should be used for this problem
z= x- µ σ or p(x)=(nCx)px 1- p ( )n-x or x = µ + z σ or z= x - µ σ n e) None of the above are correct.
What is the significance of the correlation coefficient and how is it used? Provide an example in your response.
From a deck of 52 cards, 2 cards are drawn at random, but you do not replace the first card before drawing the second. What is the probability that
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Average performance evaluation is higher for managers hired from outside firm compared with those promoted from within? What other stories does this graph tell?
What is the probability that there will be exactly one set of triplets among 700 births in a large hospital?
a binomial experiment which has the probability of success for one trial p 0.63 is being observed and 70 trials are
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What is the company's free cash flow for year 1 of this project?
suppose the present value of a risky investment is approximately normally distributed with mean 10000 and standard
A CNN Poll in May 2016 contacted a random sample of 1001 adults and asked the question "overall do you favor or oppose laws that guarantee equal protection for transgender people in jobs, housing, and public?" in the sample, 750 of the people said..
What is your approach? Also, what about the other components of hypothesis testing such as confidence level?
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