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Let X have a Poisson distribution with a mean of 4. Find
The assistants have .50 probability of going on strike, .40 the pilots and .15 that both go on strike.
It supposes that a procedure produces a binomial distribution with a repeated test n times. It uses a-1 table to calculate the probability of x successes
50% probability a customer will walk through the door needing customer service. What percent of the time would you expect less than 4 customers
Births of Twins The probability that a birth will result in twins is .012. Assuming independence (perhaps not a valid assumption), what are the probabilities
An insurance company sells an automobile policy with a deductible of one unit. Let X be the amount of the loss having p.m.f.
A random variable X has a binomial distribution with mean 6 and variance 3.6. Find P(X = 4).
Blood cocaine concentration (mg/L) was determined both for a sample of individuals who had died from cocaine-induced excited delirium (ED)
A metropolitan school system consists of two districts- north and south. the north district contains 60% of all students, and the south district
A group of n people meet at lunch for a cup of coffee. They play a game to see who gets to pay for all the coffees. Each person flips a coin
Bob Jones of the Alaskan Bears baseball club had the highest batting average in the 2000 Major League Baseball season. His average was .335
According to a recent census, 52.2% of New York residents are male. Suppose a group of 100 New York residents are selected at random.
Age effects in medical care. The type of medical care a patient receives may vary with the age of the patient. A large study of women who had a breast lump
The weekly salaries of teachers in one state are normally distributed with a mean of $490 and a standard deviation of $45.
A market research firm conducts telephone surveys with a 40% historic response rate. What is the probability that in a new sample of 400 telephone numbers
A financial advisor has recommended two possible mutual funds for investment: Fund A and Fund B. The return that will be achieved by each of these
The table below describes the smoking habits of a group of asthma sufferers.
Two hundred raffle tickets are sold. Your friend has 5 people in her family who each bought two raffle tickets.
The events A and B are mutually exclusive. Suppose P(A) = .30 and P(B) = .20. What is the probability of either A or B occurring? What is the probability
Assume that 12 jurors are selected from a population in which 50% of the people are Mexican-Americans. The random variable X is the number of Mexican-Americans
Find the z-score for each of the following X values. (Note: You should be able to find these values using the definition of a z-score
A Private firm reports that 8% of the 2 million small businesses who apply for loan each year receive special interest rate (usually higher than market rate)
With one method of a procedure called acceptance sampling, a sample is items is randomly selected without replacement and the entire batch is accepted
Marty's Barber Shop has one barber. Customers have an arrival rate of 5 per hour. Use the Poisson arrivals and exponential service times model
Suppose that four inspectors at a film factory are suppose to stamp the expiration date on each package of film at the end of the assembly line.