q13 ssment/Ouiz aspx?id = 701 DAC49. 2B99-4F DA-B4D0-3632DD8DA4E2 Question 13 Us
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q13
ssment/Ouiz aspx?id = 701 DAC49. 2B99-4F DA-B4D0-3632DD8DA4E2 Question 13 Use the appropriate normal distribution to approximate the resulting binomial distributions. A fair coin is tossed 130 times. What is the probability of obta a) 0.7401 b) 0 0.7709 Review Later c) O 0.7406 d) 0.7358 e) 0.7680 ) . None of the above Question 14 use eappr priamo m dst i on napp nami ei erea me biu m al dism ut ons. A conve no s lon ower da ni at 55% o the people buying from her stre, on a certa day of the week, buy coffee during their visit. A random sample of 35 customers is made. If the store owner's claim is correct, what is the probability that fewer than 22 customers in the sample buy coffee during their visit on that certain day of the w a)0.8413 b) 0.7967 c) 0.8238 d) 0.7764 e) 0.7224 eek?Explanation / Answer
n = 130 p = 1 - p = 0.5
= n * p = 130 * 0.5 = 65
= (np(1-p)) = (65*0.5) = 5.7009
P(60.5 < z < 77.5) = P((60.5 - 65) / 5.7009) < z < (77.5 - 65) / 5.7009))
= P(-0.7893 < z < 2.1926)
= 0.9858 - 0.2150
= 0.7708
The correct answer is b)
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