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At a pre-school, teachers have found that, on average, 85% of children will drink milk. In a randomly chosen class of 20 children, what is the probability that at most 16 children will drink milk?
Let A and B be 2 sets, and let P(A) and P(B) denote the probabilities assigned to the 2 sets. If we know that A is a subset of B what is the relationship between P(A) and P(B)?
The man-hour estimate for test and evaluation was based on using expert opinion to come up with optimistic, pessimistic and most likely positions. This resulted in a triangular distribution with a m
Explain the difference between a treatment group and control group. Be specific and thorough, (a couple paragraphs should be fine) are these included in experimental, observational studies, or both?
An airline knows that 5% of the people making reservations on a certain flight will not show up. Consequently, their policy is to sell 52 tickets for a flight that can only hold 50 passengers. What
Suppose a pitcher throws a fastball 80% of the time and a curveball 20% of the time. When it's a fastball, a Home Run is made 8% of the time and when a curveball is thrown, a home run is made 5% of
Describe how you would use a random number table to get a random sample of 50 people who had listed phone numbers in a phone book that had 7500 people with listed numbers.
Ten is the average number of oil tankers arriving each day at a certain port city. The facilities can handle at most 15 tankers per day. What is the probability that on a given day, tankers will hav
The frequency distribution below shows the distribution for suspended solid concentration(in ppm) in river water of 50 different waters collected in September 2011.
The number of cracks in a section of interstate highway that are significant enough to require repair averages 2 per mile. What is the probability that there will be at least 1 crack in the next mil
There are 17 broken lightbulbs in a box of 100 lightbulbs. A random sample of 3 lightbulbs is chosen without replacement. What is the probability that the sample contains no more than 1 broken lightbu
Suppose that a computer programmer, on average, makes 3 errors in 500 lines of code. What is the probability that the programmer will make no errors in 250 lines of code?
A study of various news home pages reports that the mean number of bad links per home page is 0.4. If the errors occur randomly and independently, find the probability that a randomly selected home
A professional hockey player played 20 seasons. The following table shows the number of games in which he played during each of his 20 seasons. How to obtain and interpret the quartiles.
A fair die is thrown until the sum of the results of the throws exceeds 6. The random variable X is the number of throws needed for this. Let F be the distribution function of X. Determine F(1), F(2
The following data lists the avarage monthly snowfall for January in 15 cities around the US:Find the mean, variance and stadard devaition.
A random sample of 100 credit sales in a department store showed an average sale of $120.00. From past data, it is known that the standard deviation of the population is $40.00. Provide a 95% confid
Suppose 65% of all registered votes in a certain area favor a 7-day waiting period before purchase of a handgun. Among 225 randomly selected voters, what is the mean and standard deviation of the nu
A sample survey interviews an SRS of 267 college women. Suppose that 70% of all college women have been on a diet within the last 12 months. What are the mean and standard deviation of the sampling
A pollster conducts a survey to determine the proportion of voters who favor his candidate. Out of 1,447 people surveyed, 562 say they like the candidate. What is the 99% margin of error for the pr
The weekly amount spent for maintenance and repairs in a certain company has an approximately normal distribution with a mean of $600 and a standard deviation of $40. If $700 is budgeted to cover re
The lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. Random samples of 100 women are randomly selected and the mean of each sample is dete
Random samples of 100 women are randomly selected and the mean of each sample is determined. Find the standard deviation of the sampling distribution.
If I go into a pizza house, and I have the choice of having one of 3 different types of dough, with one of 7 different toppings, and one of 4 different types of grated cheese shakers, how many times
A list of 50 subjects is entered into a computer file and then sorted by last name. The subjects are assigned to five treatments by taking the first 10 subjects for Treatment 1, the next 10 subjects