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Each of 12 refrigerators of a certain type have been returned to the distributor because of loud noise. Suppose that 7 of these have defected compressor and 5 have a broken ice cube tray. The refigerators will be excamined one by one in ramdon order. Let X be number amoung the first 6 examined that have a defective compressor. Calculate :
1) P(x=5)
2) P(<= 4)
3) The expected value ot X
Determine the overall probability (rating), given all the ratings and weightings that, when A, B, C, D and E are combined.
Discuss how the empirical rule helps explain the ways in which the values in a set of numerical data cluster and distribute. Regarding probability, discuss the differences between mutually exclusive events and collectively exhaustive events.
athe manager hires you to analyze the data she collects and the results for the above questions are as
Time spent using email per session is normally distributed with μ = 8 minutes and σ = 2 minutes. a) What is the probability that the sample mean is between 7.8 and 8.2 minutes?
Examine the behaviour of 99% critical values for these degrees of freedom, and comment on the limits in this case.
Annually from tornadoes in the U.S.A. is less than 30. If a sample of 9 randomly selected years had a standard deviation of 29, is the claim believable? Use = .01?
At the .05 level of significance, is there evidence of a difference in the mean ontime percentages for the 25 airports between September 2009 and September 2010?
35 people that spend on average less than 62 minutes per day on facebook? Assume this is normally distributed. Find the chances of each to decide which is more likely, and by how much.
the cost of a college education has increased at a much faster rate than costs in general over the past twenty years.
research the library and provide at least 1 example of how a real company has used each of the following multivariate
The probability of success for any trial of a binomial experiment is 25%. Find the probability that the proportion of successes in a sample of 500 is less that 22%. Repeat with a sample of 800. Repeat with a sample of 1,000.
A demonstration to verify that an item meets its reliability requirement is based on obtaining 5 successful tests. If the probability of a successful test is 0.9, find the probability that 10 tests will be required to pass the demonstration.
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