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A gambler has a fair coin (with one head and one tail) and a two-headed coin. He selects one of the coins at random, and when he flips it, it shows heads. Suppose that he flips the same coin a second time and again it shows heads. Then he flips the coin 2 more times. What is the expected number of heads across all 4 flips and the variance of the number of heads across all 4 flips?
a local unemployment office keeps track of the number of new claims filed each day. based on data collected it
The null hypothesis is to be tested at the 10% level of significance. The critical value from the table is:
You have $380,000 in your bank account. The interest rate in your account is 5%. Solve for the following showing your work: How much interest will you accumulate if interest is compounded annually over the next five years?
Problem based on combinatory - how many different license plates are possible?
Past studies indicate that only 85% of booked passengers show up for their flight. Find the probability that if the airline books 150 persons for a 140-seat plane, not enough seats will be available.
A survey taken in a restaurant shows the following number of cups of coffee consumed with each meal. Construct an ungrouped frequency distribution.
A partial computer output from a regression analysis as follows. The regression equation is:
Which of the following sets of data provides the clearest diffrence between the two samples?
The probability of accepting a lot that is 10% defective is .677. Does that mean, then, that the probability of rejecting the lot is 0.333?
Management plans to sample 150 packages per week. What is the appropriate control chart?
a bank manager wanted to double-check her claim that recent process improvements have reduced customer wait times to an
are 14 of mampm candies yellow? mars claims that 14 of its plained candies are yellow and a sample of 100 such candies
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