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One of the cards from an ordinary deck of 52 cards is lost. What is the probability that a random card drawn from this deck is a spade?
Suppose 40% of the students of a campus are women. If 20 % of the women and 16% of the men of this campus are A students, what percent of all of them are A students?
Suppose we toss a fair die twice. Let E denote the event that the sum of the two tosses is 7, and F denote the event that the first toss equals 4. Are these two events, E and F, independent? Please
Carter Motor Company claims that its new sedan, the Libra, will average better than 20 miles per gallon in the city. Identify the type I error for the test and state the possible error by addressing
The expected number who filed electronically in this group of 15 taxpayers. That is, fidn the mean of this distribution. The standard deviation of this distrubiton
Nine different colored flags are available to place on a pole, one beneath another. The arrangement of the colors indicates the message.
Find the mean number of credit cards. Find the standard deviation in this distriubtion of credit cards
Indicate whether each statement refers to a uniformly distributed variable, normally distributed variable, and/or an exponentially distributed variable. The area under the graph of the probability d
During a quality control routine at the light bulb factory you pull a case of 100 bulbs. Suppose that each case has 3 bad bulbs. If you draw one package of 4 bulbs from the case what is the probabil
A trucking firm delivers appliances for a large retail operation. The packages (or crates) have a mean weight of 300 lb. and a variance of 2209. (Give your answers correct to four decimal places.)
According to teh Nationwide Personal Transportaion Survey conducted by the U.S. Department of Trasportation, the mean age of a car in 1995 was 8.33 years. Car ages are distributed normally. Based on
Airfares were based on the total ticket value, which consisted of the price charged by the airlines plus any additional taxes and fees. Assume domestic airfares are normally distributed with a stand
Two vehicles in succession are observed moving through the intersection of two streets. List the possible outcomes, assuming each vehicle can go straight, turn right, or turn left.
When a survey calls residential telephone numbers at random, only 36% of the calls reach a live person. You watch the random dialing machine make 17 calls.
Consider a regular polygon (all sides are of equal length) with n sides.How many triangles are formed if no side of the polygon can be a side of a triangle?
What percentile is associated with a T score of 39? How do you work it out?
Sunita's job is to provide technical support to computer users. Suppose the arrival of calls can be modeled by a Poisson distribution with a mean of 5.7 calls per hour. What's the probability that
What is the maximum request rate? that you can handle if you want the probability that a user will have to wait to be no more than 5%?
You conducted a t-test. You found a statistically significant difference between your groups even though your sample size was relatively small. Upon conducting a post hoc power analysis you found th
The number of bank robberies that occur in a large North American city is Poisson distributed with a mean of 1.8 per day. Find the probabilities of the following events
Students take at least 2 courses out of Arts, History, and Science. 60% take Arts,80% take History,70% take Science. How many students take all 3?
Assume that women's heights are normally distributed with a mean of 63.6 inches and a standard deviation of 2.5 inches. If 90 women are randomly selected, find the probability that they have a mean
The probability that a university graduate will be offered no jobs within a month of graduation is estimated to be 5%. The probability of receiving one, two, and three job offers has similarly been
The cost of parking is 3.5 dollars per hour. Calculate the mean and standard deviation of the amount of revenue each car generates.