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The present values of a 10-year life annuity on (60), and a 10-year compound inter- est annuity, with annual payments of 1, are given, respectively by a 60(110) = 5 and a (110; v) = 6. A person age 60 has 100 000 that he plans to pay as a single premium for a life annuity, beginning at age 60. This will provide a level income of 12 500 per year for life. What will the yearly income be if, instead of a straight life annuity, he purchases a life annuity with a 10-year guaranteed period?
Your office has just received 110 insurance claims to be processed in the next few days. What is the probability that fewer than 45 of the claims have been padded?
An efficiency study was done on the delivery of first-class mail originating from the four cities listed in the following table. Recorded for each city was the average length of time (in days) that it took a letter to reach a destination in..
Shirley runs a real estate company. She counts the total number of flats that she sells everyday. Let X_t be the total number of flats she sells on day t (t=1,2,...,7), and let X be the total number of flats she sells for the week.
Last week Sarah had exams in Math and in Spanish. On the Math exam, the mean was u, = 30 with a = 5, and Sarah had a score of X - 45. On the Spanish exam, the mean was u, = 60 with 0 = 6 and Sarah had a score of X = 65. For which class must Sarah ..
A small New England college has a total of 400 students.The Math SAT is required for admission, and the mean score of all 400 students is 620. The population standard deviation is found to be 60. The formula for a 95% confidence interval yields th..
Using the p-value approach, test the hypotheses at the 1% level of significance.
A group of 47 randomly selected students have a mean score of 20.2 with a standard deviation of 4.6 on a placement test. Construct a 90% confidence interval for the mean score, , of all students taking the test.
if data containing two variables x and y with x as the only predictor variable for y were standardized the slope of a
A sample of 49 repairs showed an average overhaul of 285 hours with a standard deviation of 50 hours. Calculate a 95% confidence interval for the average overhaul.
parts manufactured by an injection molding process are subjected to a compressive strength test. twenty samples of
problem 1if various samples of size 15 that is each sample consists of 15 items were taken from a large normal
Women have been on a diet within the past 12 months. Using Normal approximation, what is the probability (±0.001) that 76% or more of the women in the sample have been on a diet?
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