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A grocery store is sponsoring a sales promotion where the cashiers give away one of the letters: a, e, l, s, u, v for each purchase. if the customer collects all six, he or she gets $20 worth of gro
What fraction of the pints of blood used do you expect were contaminated? Derive your answer both intuitively and using the algebra of probabilities.
According to a hospital administrator, historical records over the past 10 years have shown that 20 percent of the major surgery patients are dissatisfied with after-surgery care in the hospital.
If engines are randomly selected one at a time and tested, describe the Probaility Mass Function to use if we want to calculate the probaility that the first working engine will be found on the nth
What must be the probability of seven people in a household for this to be a legitimate discrete density? What is the probability that a randomly chosen household contains more than five people?
If the customer collects all six, he or she gets $20 worth of groceries free. What is the expected number of trips to a store a customer needs to make?
An oil exploration firm is formed with enough capital to finance ten explorations. the probability of a particular exploration being successful is .1. Assume the explorations are independent. Find t
If we increase the size of our sample, for ex. the pairs of data that we collect. Will this affect linear correlation coefficient and coefficient of determination? Please explain.
Let T be an exponential random variable for the failure of the screen for a television set, with a mean time to failure of 10,000 hours. If the set is operated an average of 6 hours per day:
Thus, it can end as early as the 4 th game (a "sweep") or as late as the 7 th game, with one team winning its fourth game after having lost three of the ?rst six games. Calculate the probability tha
Let X follows a binomial distribution with mean equals .55 and standard deviation equals .7228. Find n and p
A truck repair facility has room to work on 5 trucks at a time. The company has 50 trucks out in the field eah day. The probability of any truck breaking down is 10%. What is the likelihood that mor
The value of Twitter has been growing exponentially at a rate of 150% a year. If the company was worth $0.5 million in 2010, during what year will Twitter become worth $10 billion?
How big does the return have to be to put a domestic stock fund in the top 10% for the three-year period (to 2 decimals)?
Discuss the data that the graph is used to visually represent. Speculate on why the editor chose the graph, as opposed to merely reporting the data.
Two chips are chosen at random from a box containing 8 blue, 4 green, and 2 orange chips. We win $2 for each green chip Selected and we lose $1 for each blue chip selected. Let X donate our winnings
A sample of 100 families was drawn for analysis of the average grocery spending. Assume that the individual weekly expences are normally distributed, with the unknown population average and populati
Write Q as a linear function of t. What is the slope? What does it tell you about the trend of Quaker Parrots in Austin? Now, rewrite Q as an exponential function of t. What is the growth rate? What
Give the equation for the standard deviation of a random variable X over an entire population with probability mass function f(x) and with a known μ.
Give the equation for the standard deviation of a sample drawn from a population with a known mean µ. Give the equation for the standard deviation of a sample drawn from a population with unknow
According to one study that looked at the percent of left-handed people by state, 11.6% of people in Indiana are left-handed. You survey 15 Indiana residents at the state fair and ask whether they a
Define F in terms of the story and name the distribution and its parameters. What is the expected number of people in his sample that have toe-nail fungus?
Let A be the number of rounds until Lionel wins his first stuffed animal. What is the distribution and parameters of A? Also, find the expected value and variance of A.
Find the probability that he gets at least 3 emails on a particular day? What is the standard deviation of the number of emails that Tim gets in one day?
Compute the mean of the sample means and compare it to the population mean. (Round your answers to 1 decimal places.)