According to a survey conducted by TD Ameritrade, one out of four investors have exchange-traded funds in their portfolios (USA Today, January 11, 2007). Consider a sample of 20 investors. a. Compute the probability that exactly 4 investors have exchange-traded funds in their portfolios. b. Compute the probability that at least 2 of the investors have exchange-traded funds in their portfolios. C. If you found that exactly 12 of the investors have exchange-traded funds in their port- folios, would you doubt the accuracy of the survey results? d. Compute the expected

Q: In a standard deck of cards, what is the probability that a person selects first a face card and…

A: given data  standard deck of 52 cards  select cards without replacement P(first face card and then…

Q: A leading large college recently reported that 40.5% of its student body had concerns about the…

A:

Q: A manufacturing machine has a 5% defect rate. If 9 items are chosen at random, what is the…

A: Given:  5% defect rate. If 9 items are chosen at random

Q: The conditional algebritis affects 15% of college professors. The blood test for algebritis…

A: From the given information, The percentage of affect is 15% That is, P(affect)=0.15 and P(not…

Q: A recent survey found that 63% of college students attend more than one institution during their…

A: Since you have posted a question with multiple sub-parts, we will solve first 3 sub-parts for you.…

Q: According to Costco's records, 25% of customers who make a purchase return the item for a refund or…

A: Given n=10 P=0.25

Q: 3. A recent report was issued that suggested 45% of all cell phone calls in 2022 will be scams.…

A: The provided information is  n=500 p=0.45 X~B(n=500,p=0.45)   The mean and variance is…

Q: Suppose the budget has the support of 54​% of the voters. What is the probability that the​…

A: The proportion of population in support follows normal distribution with mean 0.53 and standard…

Q: Ms. Bergen, a loan officer at Coast Bank and Trust, estimates a probability of 0.025 that an…

A:

Q: 11 of the 744 digital video recorders​ (DVRs) in an inventory are known to be defective. What is the…

A: From the provided information,11 of the 744 digital video recorders​ (DVRs) in an inventory are…

Q: According to the U.S. Census Bureau, 19.1% of U.S. households are in the Northeast. In addition,…

A: Introduction: Denote A as the event that a household in the country earns $75,000 per year or more,…

Q: A bank determines that 10% of all borrowers default loans. Answer the following questions, when, in…

A: Givenp=0.10sample size(n)=15Let "x" be the no.of loans are…

Q: Ecording tó thẻ Nèw York Times, eleven percent of parents helped their college ildren write an…

A: Given data,p=11%=0.11n=7P(X≤2)=?

Q: Suppose that 9% of college undergraduates suffer from a psychological disorder. What is the…

A: Let p be the probability that an undergraduate has a psychological disorder. Given that p = 0.09 Let…

Q: 15% of adults in the United States do not make New Year's resolutions. Suppose a random sample of…

A: 15% of adults in the United States do not make New Year's resolutions. Suppose a random sample of…

Q: As you shop for dog treats, a seller advertises that 95% of veterinarians recommend their treats.…

A: The probability distribution function of binomial distribution is: Where, n = sample size, x =…

Q: From the consulting company records 70% of the stocks are profitable over the next year. What is the…

A:

Q: Suppose that you and two friends go to a​ restaurant, which last month filled approximately 90.9% of…

A:

Q: According to a survey, 36.7% of people who visit Disney World have children under 18 in their…

A: A: People who visit Disney World have children under 18 in their household   B:  Household with…

Q: A Marriott Hotel has 250 rooms.  Considering this population, 15% are considered premium rooms.  On…

A: 1] population proportion p=15%=0.15 2] n=250 3] q=1-p=0.85

Q: According to a​ study, 65.8​% of college freshmen majoring in business said that​ "to get training…

A: Step 1:The given is a binomial distribution. A binomial distribution is the likelihood of observing…

Q: Just before a referendum on a school​ budget, a local newspaper polls 357 voters to predict whether…

A: Given, n = 357 p = 53% = 0.53

Q: A financial advisor is considering choosing four new companies for a client's portfolio. Suppose we…

A: As Prof. N. G. Das said "Let there are n trials and each having two outcomes - Success and Failure.…

Q: In 2021, 500 teachers in GCPS were surveyed. 230 teachers surveyed were Science teachers, 200…

A: Given: N=500 N(S)= 230 N(M)=200  Half of the teachers teaching Math also teach a science subject.…

Q: A fuel company conducts a geologic survey, that has a 20% chance of striking an oil reserve. What is…

A: Geometric distribution: The probability mass function of Geometric distribution is P(n) = p(1 - p)n…

Q: At a chocolate company, on average 5 chocolate are poisonous which makes children sick. a. What is…

A: Given: Average 5 chocolate are poisonous which makes children sick means λ = 5. The pmf of poisson…

Q: Suppose that on any particular sales call, a certain saleswoman has a 18% chance of making a sale.…

A: Let X be a random variable. Given that p = 0.18  and.  x = 14

Q: Assume that 30% of university students in UK had the experience of using LinkedIn. If we randomly…

A:

Q: Suppose the probability of an IRs audit is 4.2 percent for U.S taxpayers who file form 1040 and who…

A:

Q: Approximately 90% of all people are night-handed. Consider a grouping of ten people. What is the…

A: Percentage of right handed people is 90%. Number of total people in a group is 10.

Q: Just before a referendum on a school​ budget, a local newspaper polls 424 voters to predict whether…

A: It is given that ,just before a referendum on a school​ budget, a local newspaper polls 424 voters…

Q: it is estimated that 4800 of the 24,000 voting residents of a town are against a new sales tax. If…

A: Given: Number of residents against a new sales tax (x)= 4800 Total voting residents (N)=24000

Q: According to the U. S. Statistical Abstract 2009, about 25% of persons age 18 - 24 participated in…

A: Given, p = 25% = 0.25 n = 64

Q: acobs & Johnson, an accounting firm, employs 17 accountants, of whom 6 are CPAs. If a delegation of…

A: p = 617=0.3529 ========================

Q: On average, 10 people per hour conduct transactions at a special services desk in a commercial…

A:

Q: A mortgage advisor sells on average 3.5 mortgages every two weeks. i. What is the probability that…

A: (i) Obtain the probability that they sell 5 mortgages in a two week period. The probability that…

Q: According to a recent article on the website www.fivethirtyeight.com, 30% of Americans say they’re…

A: According to our guidelines we can answer only one question at a time. Kindly re-post other…

Q: When a customer places an order with SunShine on-line supplies, a computerized accounting…

A:

Q: 3. Dagupan Bank reviewed its credit card policy with the intention of recalling some of its credit…

A: Given Information: 5% of cardholders defaulted The probability of missing a monthly payment is 0.20…

Q: A financial services committe had 60 members, of which 9 were women. If 7 members are selected at…

A: Given that, A financial services committee had 60 members, of which 9 were women. So (60-9)=51 are…