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An MP3 manufacturer claims that 65% of teenagers 13 to 16 years old have their own MP3 player. A researcher wishes to test the claim and selects a random sample of 80 teenagers. She finds that 57 have their own MP3 players. At a=0.05, should the claim be rejected?
A survey of 600 non-fatal accidents showed that 111 involved the use of a cell phone. Find a point estimate for p, the population proportion of accidents that involved the use of a cell phone.
a newspaper finds that the mean number of typographical errors per page is four. find the probability that more than
a automobile manufacturer produces 77 of its cars at plant a. 5 of car made at plant a have a malfuction. what is
Let X be the number of kings selected and Y the number of jacks selected. Find the joint probability distribution function.
suppose you own a reliability system that consists of two components connected in series with the first one having
A) What is the name of the distribution of the number of satisfied customers from this sample? B) What is the expected value? C) What is the standard deviation?
A local bank reported to the federal government that its 5,246 saving accounts have a mean of $1,000 and standard deviation of $240.
Annual starting salaries for college graduates with degrees in business administration are generally expected to be between $30,000 and $45,000.
Find the probability that you will (a.) make your first sale on your fifth call, (b.) make your sale on the first, second or third call, and (c.)do not make a sale on your first three calls.
If a random sample of 8 adults is selected from the city, find the probability that exactly 3 adults respond that they enjoy using public transportation.
question the hughes supply company uses an inventory management method to determine the monthly demands for various
An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of 3.3 emails per hour. Assume the arrival of these emails is approximated by the Poisson distribution.
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