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Suppose that the life expectancy X of each member of a certain group of people is an r.v. having the Negative Exponential distribution with parameter l = 1/50 (years). For an individual from the group in question, compute the probability that
i) He will survive to retire at 65;
ii) He will live to be at least 70 years old, given that he just celebrated his 40th birthday;
iii) For what value of c, P(X > c) = 1?
What is the probability that the average will be 140 lbs or longer if the individuals are randomly selected and calculate the z-score for an x of 21.5 from a sample of size 25.
Suppose the p-value for these test is 0.03. Is the difference in percentages at a 5% level? Explain. Suppose the p-value for this test is 0.03. Is the difference in percentages significant at a 1% level? Explain. What is the overall (weighted) sample..
an irate customer called dollar day mail order company 40 times during the last two weeks to see why his order had not
What is the probability that only the first child will have cystic fibrosis? What is the probability that they will have 2 normal sons and 1 daughter with cystic fibrosis?
1. if x is normally distributed with a mean of 70 and a standard deviation of 7 finda. px less than or equal to 76b.
Find the probability that not enough seats will be available. Is this probability low enough so that overbooking is not a real concern?
Which of the statements about line-balancing is true and if a precedence relationship exists between tasks A and B, they cannot be assigned to the same work station.
question during the previous presidential elections in the united states very long wait times have been witnessed at
when an opinion poll calls residential telephone numbers at random only 20 of the calls reach a live person. you watch
A University of Omaha is concerned that out of state students may be receiving lower grades than in state students. Two independent random samples have been selected: 165 observations from population 1 (Out of state students) and 177 from population ..
There are two major tests of readiness for college, the ACT and the SAT. ACT scores are reported on a scale from 1 to 36. The distribution of ACT scores for more than 1 million students in a recent high school graduating class was roughly normal with..
Calculate the expected value and variance of X - Plot the sampling distribution of the average of 10 independent observations of X using N=100000 iid samples.
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