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A test consists of 10 true/false questions. If a student guesses on each question, what is the probability that the student will answer at least 9 questions correctly.
Suppose that in a certain population 46% of people have type O blood. A researcher selects people at random from this population. What is the probability that there is a person with type O blood amo
100 are tested and if more than two are nonconforming, the shipment is returned to the alternator manufacturer. What is the probability of returning a shipment?
A random variable X has the probability distribution shown in the graph below. What is the probability that X will be less than or equal to 1.75?
A survey was mailed to a total of 400 students; 100 were randomly selected from each of the freshman, sophomore, junior and senior classes last semester. What sampling method was used?
Suppose you have a set of blood pressures with a mean of 80 diastolic and standard deviation of 5 points. assuming a normal distributions of blood pressures, what two values should 95% of all blood
Let Y denote the number of trials necessary to achieve this. List all outcomes corresponding to the five smallest possible values of Y, and state which Y value is associated with each one.
For a particular sample of 77 scores on a psychology exam, the following results were obtained. first quartile= 44, third quartile= 71, standard deviation=6,range=45, mean=64, median=57, mode=92, a
A coworker is considering the use of a log linear (power) model using weight to estimate the cost of a missile engine. They have performed the following calculations in log space using natural logar
Allen Young has always been proud of his personal investment strategies and has done very well over the past several years. he invest primarily in the stock market as a good investment. in some cas
Jill scores 680 on the mathematics part of the SAT. The distribution of SAT scores in a reference population is normally distributed with mean 500 and standard deviation 100. Jack takes the ACT mat
Normal distribution with a mean of 68 years and a standard deviation of 3.5 years. What proportion of the plan recipients would receive payments beyond age 75?
Service times are exponentially distributed and average 24 per hour. Customers that arrive when all seats are taken do not enter the diner. The probability that there are no customers in the diner i
X is a normally distributed random variable with a mean of 12 and a standard deviation of 3. Calculate the probability that x equals 19.62.
An auditor wants to estimate what proportion of a bank's commercial loan files are incomplete. The auditor randomly samples 80 files and finds 12 are incomplete. Using a 95% confidence interval, es
If the scores are approximately normal with mean 544 and standard deviation 103, what minimum score would a student need in order to score in the top 10% of those taking the test?
If X is a random variable with probability generating function GX(s) and k is a positive integer, find the probability generating functions of Y=kX and Z=X+k
One of the children, though, fails to solve the problem so the researcher has an undetermined score. What is the best measure of central tendency for these data?
Can the magazine and/or th companyy profit by advertising and selling mens shoes?
If there are 75 baskets of tomatoes available to be sold at the roadside stand at the beginning of a day, what is the probability that they will all be sold by the end of the day?
They select every 20th person from the list until a sample of 100 is obtained. They then call these 100 people. Does this sampling plan result in a random sample? Simple random sample? Explain.
The price of a corporate bond is uniformly distributed between $70 and $95. Determine the expected price of the bond.
In determining automobile mileage ratings, it was found that the mpg in the city (x) for a certain model is normally distributed, with a mean of 24 mpg and a standard deviation of 1.0 mpg. find the
The time between arrivals of customers at the drive-up window of a bank follows an exponential probability distribution with a mean of 10 minutes. What is the probability that the arrival time betw
Alternatively, it is estimated that there is a 95% probability of only slight losses of around $1 million. Using decision tree analysis, determined whether the bank should install the new power gene