capacity less than 66,000. Divide by the totail number of sports stadiums in the
ID: 3041325 • Letter: C
Question
capacity less than 66,000. Divide by the totail number of sports stadiums in the sample. (Round your a 0.7123X Part 1) O They are not the same because the normal distribution is only an approximation 25. 214 we flip a coin 100 times . 100) and note that it only comes up heads 20% (p-0.20) of the time. The mean and standard deviation for the number of times the coin lands on heads is -20 and -4 (verify the mean and standard deviation). Solve the following. (Round your percents to two decimal places.) (a) There is about a 68% chance that the number of heads will be somewhere between 16 (b) There is about a 95 (e) There is about a 99.7 (smaller value) and 24 X %chance that the number of heads will be somewhere between 12 and 28. X %chance that the number of heads will be somewhere between eight and 32 Notes on its website that detail the growth and popularity of the site. On average, 23 percent of 18 to 34-year-olds out of bed in the morning. Suppose this percentage follows a normal distribution with a standard deviation of five percent. (a) Find the probability that the percent of 18 to 34-year-olds who check the social network before getting out of bed in the morning is at least 29. (Round your answer to four sC 20 13 rsExplanation / Answer
For parts (b) and (c), I think it's a rounding error which is leading to incorrect answers.
(b). Using MS Excel, the probability that the number of heads lies between 12 and 28 = (=NORM.DIST(28,20,4,TRUE)) - (=NORM.DIST(12,20,4,TRUE)) = 0.97725 - 0.02275 = 0.9545.
So the correct answer is 95.45%
(c) The probability that the number of heads lies between 8 and 32 = (=NORM.DIST(32,20,4,TRUE)) - (=NORM.DIST(8,20,4,TRUE)) = 0.99865 - 0.00135 = 0.9973
So there is about 99.73% chance that the number of heads will lie between 8 and 32.
Hope it helps.
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