Mathematics, 13.12.2019 04:31 lee1677
Arandom sample of size n1equals25, taken from a normal population with a standard deviation sigma1equals6, has a mean x overbar 1equals87. a second random sample of size n2equals33, taken from a different normal population with a standard deviation sigma2equals4, has a mean x overbar 2equals36. find a 96% confidence interval for mu1minusmu2.
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Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?
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Ellen makes and sells bookmarks. she graphs the number of bookmarks sold compared to the total money earned. why is the rate of change for the function graphed to the left?
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Arandom sample of size n1equals25, taken from a normal population with a standard deviation sigma1eq...
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