In a large consignment of electric bulb 10% are defective.A random sample of 20 is taken for inspection. Find the probability that a)all are good bulbs b) there are almost 3 defective bulbs c)there are exactly 3 defective bulbs
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- According to flight stats.com American Airlines flights from Dallas to Chicago are on Time 80% of the time. Suppose 20 flights are randomly selected and the number of on-time place is recorded A) find and interpret the probability that EXACTLY 14 flights are on time B) find and interpret the probability that FEWER THAN 14 flights are on time C) find and interpret the probability that AT LEAST 14 flights are on time D) find and interpret the probability that between 12 and 14 flights, inclusive, are on time7.) The Pew Internet and American Life Project reported in 2004 that 55% of current music downloaders say they are using paid services. Consider a random sample of 18 music downloaders.a.) Find the probability that the sample contains 15 music downloaders who are usingpaid services using the formula.b.) Find the probability that the sample contains 10 or fewer music downloaders who areusing paid services using the calculator.c.) Find the probability that the sample contains 9 or more music downloaders who areusing paid services using the calculator.d.) Find the probability that the sample contains between 8 and 15, inclusive, musicdownloaders who are using paid services using the calculator.e.) Find the mean number of music downloaders who are using paid services.f.) Find the standard deviation of music downloaders who are using paid services.A. If 6% of the population of grass in Kentucky is bluegrass, find the probability that in a sample of 150 acres, there are exactly 6 acres of Kentucky bluegrass. B. Find the probability that there are at most 2 acres of Kentucky bluegrass.
- Find the indicated probability. 21) The table below describes the smoking habits of a group of asthma sufferers. 21) Occasional Regular Heavy smoker smoker Total 543 Nonsmoker smoker Men 395 35 72 41 Women 347 40 87 39 513 Total 742 75 159 80 1056 If one of the 1056 people is randomly selected, find the probability of getting a regular or heavy smoker. A) 0.473 B) 0.151 C) 0.226 D) 0.1072) A machine that fills boxes of cereal underfills a certain proportion p. If 25 boxes are randomly selected from the output of this machine. Find the probabilitythat no more than two are underfilled when a) p = 0.1 b) p = 0.2Assume that 9% of people are left-handed. If 4 people are selected at random, find the probability of each outcome described below. ts a) Find the probability that the first lefty is the fourth person chosen. (Round to four decimal places as needed.)
- Of all the weld failures in a certain assembly, 80% of them occur in the weld metal itself, and the remaining 20% occur in the base metal. A sample of 20 weld failures is examined. a) What is the probability that exactly five of them are base metal failures? b) What is the probability that fewer than four of them are base metal failures? c) Find the mean number of base metal failures. Round the answer to one decimal place. d) Find the standard deviation of the number of base metal failures.5) Samples of size n = 2 are randomly selected with replacement from the popula- tion consisting of 2, 4, and 10, where the values represent the number of people in households. 5a) Find the mean of each of the nine samples and summarize the data in the form of a probability distribution. seroMvT as borolgo olgouq Ind upo o t te bas io 5b) Compare the population mean to the mean of the sample means in this example. Does this support the idea that sample means do not target the population means?11.) A shipment of 11 printers contains 2 that are defective. Find the probability that a sample of 4, drawn from the 11, will not contain a defective printer.
- A Gallup poll of 1,236 adults showed that 14% believe that bad luck follows if your path is crossed by a black cat. a) Find u, o?, o, and usual values. b) Use the above information to find the probability that a total of 203 subjects believe that bad luck follows if your path is crossed by a black cat. a) Use the above information to find the probability that less than 203 subjects believe that bad luck follows if your path is crossed by a black cat.An unreliable company produces a large shipment of blenders where 13% have a defective motor, and 25% have a defective electrical cord and 5% have both defects. If you randomly select a blender in this shipment, find the probability that it has... a) only a defective electrical cord. Write your answer as a percent rounded to 1 decimal place. b) a good motor. Write your answer as a percent rounded to 1 decimal place. c) a good motor and a good electrical cord. Write your answer as a percent rounded to 1 decimal place.By some estimates, twenty-percent (20%) of Americans have no health insurance. Sample of 15 Americans was taken. (4 decimal places) a) What is the probability that exactly 4 of the 15 sampled have no health insurance? b) What is the probability that less than 14 of those sampled have no health insurance? c) What is the probability that at least 2 of those sampled have no health insurance?
