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The frequency distribution of 100 families given below, the number of families corresponding to the expenditure groups. Find the missing frequency.
Aeroplanes arrive at Chicago's O'Hare airport at the average rate of 5.5 per minute. Air traffic controllers can safely handle a maximum of seven planes per minute. What is the probability that airp
A researcher is using a chi-square test to determine whether there are any preferences among four brands of cola. With = .05 and a sample of n = 30, what is the boundary for the critical region for
Assume that any single labrotory test in a 3 test battery obtained from healthy volunteers has a 5% chance of falling outside the normal range. What is the closest probability that a healthy person
Suppose 55% of students are female of which 44% have long hair and 45% of students are male of which 15% have long hair. What is the probability that a student chosen at random will either be female
Suppose your right knee is sore 15% of the time, and your left knee is sore 10% of the time. What is the largest possible percentage of time that at least one of your knees is sore and the smallest
An ice cream store offers 18 different ice cream flavors and 6 different toppings. you are able to order one or two flavors of ice cream and up to three toppings without having to pay extra. How man
Urn 1 has 5 red and 7 blue balls and Urn 2 has 6 red and12 blue balls. Pick 3 uniformly and randomly from each of the 2 Urns. Conditional on the fact that all 6 chosen were the same color, what is t
Suppose we want to determine the (binomial) probability(p) of getting 3 heads in 13 flips of a 2-sided coin. what values of n, x and p would we use to look up this probability, and what would be the
A loan officer at a bank rates applicants for credit. Ratings are normally distributed. The mean is 240 and the standard deviation is 60. If 49 applicants are randomly chosen, what is the probabilit
Suppose two dice are rolled. Assume that each possible outcome has probability 1/36. Let A be the event that the sum of the two dice is greater than or equal to 8, and let B be the event that at lea
The lifetime of ZZZ batteries is normally distributed with a mean of 270 hours and a standard deviation of 10 hours. What number of hours would represent the 40th percentile in this distribution?
A population has u=100 and σ=20. If you select a single score from this populaton, on the average, how close woud it be to the population mean? Explain your answer
Analyze and interpret the process behavior charts of selected quarterly earnings data of Southwest Airlines between 2000 and 2005.
The number of books checked out at a public library by a sample of eight primary school children were recorded: Report the mean, variance and standard deviation for this data set.
A frequency distribution was constructed for the ages of all 25 of the CEO's of the Company X. To answer the parts of this problem, use the frequency distribution given below.Calculate the mean age
Test at the 5% level if the proportion of cows with tuberculosis in the herd from which this sample is drawn is 6%.
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