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Find the probabilities values based on normal distribution
A light bulb manufacturer claims that their bulbs have a mean life-span of 720 hours with a standard deviation of 80 hours. What is the probability that the mean life-span of a sample of 64 randomly selected bulbs will exceed 727 hours?
Using the probabilities above what is the expected size of family you draw?
Is this enough evidence to support Union's position? Use significance level of a = 0.05. You may suppose the mean annual salaries are normally distributed.
Then use ogive to estimate median and first and third quartiles. Also utilize it to reply following question: What percent of 60 mutual fund loads are less than 75.
What is the probability that a cereal would be high calorie, given that it is high fiber? In other words, what is P (high calorie, given high fiber)?
Banner Mattress and Furniture Company wishes to study the number of credit applications received per day for the last 300 days.
Determine the probability that the project will be completed in 70 days or less.
The means appear to be very close, but not the variances. At α = .05, is there a difference in variances? Show all steps clearly, including an illustration of the decision rule.
A test on zoology is to be given next week. Suppose 75 percent of the students study for the test and 25 percent do not. If a student studies for the exam, the probability that he or she will pass is 0.90. If the student does not study, the pro..
The mean top of knee height of a sitting mate is 20.7 in.
What should ING's General Counsel do to minimize ING's expected costs?
At.05 level of significance can director conclude that there is difference in the number of circuit cards bought by month?
Does the normal distribution yield a good approximation of the actual results?
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