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There are 10 questions on a true-false test. A student feels unprepared for this test and randomly guesses the answer for each of these.
a. What is the probability that the student gets exactly 7 correct?
b. What is the probability that the student gets exactly 8 correct?
c. What is the probability that the student gets exactly 9 correct?
d. What is the probability that the student gets exactly 10 correct?
e. What is the probability that the student gets more than 6 correct?
Use a calculator with mean and standard deviation keys to verify that the sample mean is x = 5.63 pups with the sample standard deviation s = 1.78 pups. (b) Find a 75% confidence interval for the population.
During the period of time phone-in reservations are being taken at a local university, calls come in at a rate of one every ten minutes.
Assume the reliability of a product is given by an exponential distribution with a mean of 1 year. How long would it take to achieve a 10% failure rate?
A particular product is known to have an exponential failure time distribution with a mean of 12 months.
Many educators feel their grades should fit a normal distribution and often apply curves to make them fit one. One way to do this is to convert numeric grades to z scores using the mean and standard deviation for the grades, then use an equation s..
In a certain distribution of numbers the mean is 60 with a standard deviation of 8. Use Chebyshevs theorum to tell the probability that a number lies in each interval.
At a fair run by a local charity organization, it costs 50 cents to try one's luck in drawing an ace from a deck of 52 playing cards. What is the expected profit per customer
Plan the scatter diagram
Correlation rule states that if X and Y are correlated, X has caused Y.
What is the probability of getting someone who is in the 23-30 age brackets or whom smokes?
Formulate an appropriate hypothesis test to examine at the 10% level of significance whether the manager's worries are justified.
What different types of variables are used in quantitative studies? Describe each type of variable and how they differ.
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