A study indicates that 70% of American teenagers have tattoos. You randomly sample 5 teenagers. Find the probability that at most 5 will have tattoos.
Round your answer to 4 decimal places.
This is binomial distribution with n = 5 and p = 0.7
P(at most 5) = P(0) + P(1) + P(2) + P(3) + P(4) + P(5) = 1
The probability is 1 because we are taking all probabilies from 0 to 5 here.
A study indicates that 70% of American teenagers have tattoos. You randomly sample 5 teenagers. Find...
A study indicates that 80% of American teenagers have tattoos. You randomly sample 5 teenagers. Find the probability that at least 4 will have tattoos. Round your answer to 4 decimal places.
A study indicates that 90% of American teenagers have tattoos. You randomly sample 10 teenagers. Find the probability that at most 6 will have tattoos. Round your answer to 4 decimal places.
A study indicates that 40% of American teenagers have tattoos. You randomly sample 25 teenagers. Find the probability that more than 6 will have tattoos. Round your answer to 4 decimal places.
A study indicates that 27% of American teenagers have tattoos. You randomly sample 23 teenagers. Find the mean and the standard deviation of the number of tattoos. Round your answer to 4 decimal places.
A study by Allstate Insurance Co. finds that 82% of teenagers have used cell phones while driving (The Wal/Street Journal, May 5, 2010, Suppose a random sample of 100 teen drivers is taken. [You may find it useful to reference the z table.] a-1. Calculate the standard error for the sampling distribution of the sample proportion. (Do not round intermediate calculations. Round your answer to 4 decimal places.) Standard error a-2. Is the sampling distribution of the sample proportion approximately...
Based on a? poll, among adults who regret getting? tattoos, 14 14?% say that they were too young when they got their tattoos. Assume that five five adults who regret getting tattoos are randomly? selected, and find the indicated probability. Complete parts? (a) through? (d) below. a. Find the probability that none of the selected adults say that they were too young to get tattoos. nothing ?(Round to four decimal places as? needed.) b. Find the probability that exactly one...
Based on a poll, among adults who regret getting tattoos, 15 15% say that they were too young when they got their tattoos. Assume that eight eight adults who regret getting tattoos are randomly selected, and find the indicated probability. Complete parts (a) through (d) below. a. Find the probability that none of the selected adults say that they were too young to get tattoos. nothing (Round to four decimal places as needed.) b. Find the probability that exactly one...
A recent study examined hearing loss data for 1822 U.S. teenagers. In this sample, 343 were found to have some level of hearing loss. News of this study spread quickly, with many news articles blaming the prevalence of hearing loss on the higher use of ear buds by teens. At MSNBC.com (8/17/2010), Carla Johnson summarized the study with the headline: "1 in 5 U.S. teens has hearing loss, study says." To investigate whether this is an appropriate or a misleading...
Information from the American Institute of Insurance indicates the mean amount of life insurance per household in the United States is $135,000. This distribution follows the normal distribution with a standard deviation of $42,000. If we select a random sample of 76 households, what is the standard error of the mean? (Round your answer to the nearest whole number.) What is the expected shape of the distribution of the sample mean? What is the likelihood of selecting a sample with...
A poll agency reports that 47% of teenagers aged −12-17 own
smartphones. A random sample of
147 teenagers is drawn. Round your answers to at least four
decimal places as needed.
(d) Find the probability that the proportion of the sampled teenagers who own a smartphone is between 0.44 and 0.55 The probability that the proportion of the sampled teenagers who own a smartphone is between 0.44 and 0.55 is