question archive 1) 17 ?% of a certain? country's voters think that it is too easy to vote in their country
1) 17 ?% of a certain? country's voters think that it is too easy to vote in their country
Subject:MathPrice: Bought3
1) 17 ?% of a certain? country's voters think that it is too easy to vote in their country. You randomly select 12 likely voters. Find the probability that the number of likely voters who think that it is too easy to vote is? (a) exactly? three, (b) at least? four, (c) less than eight.
?(a) P(3)=
?(Round to three decimal places as? needed.)
Question 21
Fifty-five percent of households say they would feel secure if they had? $50,000 in savings. You randomly select 8 households and ask them if they would feel secure if they had? $50,000 in savings. Find the probability that the number that say they would feel secure is? (a) exactly? five, (b) more than? five, and? (c) at most five.
?(a) Find the probability that the number that say they would feel secure is exactly five.
?P(5)=
?(Round to three decimal places as? needed.)
Question 22
39?% of college students say they use credit cards because of the rewards program. You randomly select 10 college students and ask each to name the reason he or she uses credit cards. Find the probability that the number of college students who say they use credit cards because of the rewards program is? (a) exactly? two, (b) more than? two,
and? (c) between two and five inclusive. If? convenient, use technology to find the probabilities.
?(a) ?P(2)=
?(Round to the nearest thousandth as? needed.)
Question 23
34?% of women consider themselves fans of professional baseball. You randomly select six women and ask each if she considers herself a fan of professional baseball. Complete parts? (a) through? (d) below.
?(a) Find the mean of the binomial distribution.
μ=
?(Round to the nearest tenth as? needed.)
b. find the variance
