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The following frequency table lists the sales of an item and the number of times it has occurred. It was obtained from historical records.
Sales/Frequency: 10/100, 15/120, 20/300, 25/350, 30/400, 35/500, 40/300, 45/170.
A. Make this into a probability model (round the probabilities to the nearest thousandths).
B. What is the probability of selling more than 15 units of the item?
C. What is the probability of selling between 15 and 30 untis inclusive?
D. What is the probability of selling 40 items or less? E. Are any of the events considered unusual?
Suppose that 51% of the women who gave birth at a certain hospital last year were over 30 years old, and that 39% were unmarried.
There are 6 children in a family. The number of children defines a population. The number of simple random samples of size 2 that are possible equals:
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Can we conclude a difference in means? YES or NO (circle one)
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One school found that 28.6% of all students are liberal. You wonder whether this percentage is different at your school, but don't know whether it's higher or lower. What hypotheses will you test to see if your school significantly differs from th..
The average time a subscriber spends reading the Wall Street Journal is 49 minutes. Assume that the standard deviation is 16 minutes and the time are normally distributed .
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The manager of Sam's Food Mart guarantees that none of his cartons containing a dozen eggs will contain more than one bad egg, despite the fact that 4% of individual eggs are known to be bad. Define the random variable x to be the number of bad eg..
At the .05 significance level, can we conclude that the guideline is still reasonable?
Air-America has a policy of booking as many as 14 people on an airplane that can seat only 12. (Past studies have revealed that only 92% of the booked passengers actually arrive for the flight.)
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