Question 1
A local newspaper claims that 70% of the items advertised in its classifieds section are sold within 1 week of the first appearance of the ad. To check the validity of the claim, the newspaper randomly selected
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advertisements from last year's classifieds and contacted the people who placed the ads. They found that 16 of the 25 items sold within a week. Based on the newspaper's claim, is it likely to observe
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who sold their item within a week? Use a binomial probability table.
Question 2
If x
is a binomial random variable, calculate μ for n = 70 and p = 0.4.
◦ 35
◦ 28
◦ 16.8
◦ 2.8