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You arrive at a bus stop at 8:00 a.m. knowing that the bus will arrive at some time uniformly distributed between 8:45 and 9:03. (a) What is the probability that you will wait at least 40 minutes? (b) What is the probability that you will wait more than 51 minutes? (c) What is the probability that you will wait at most 57 minutes? (d) What is the probability that you will wait at least 50 minutes? (Hint: what is the relationship between the bus's arrival and your waiting?)
A medical doctor wishes to test the claim that the standard deviation of the systolic blood pressure of deep sea divers is less than 450. To do so, she selected a random sample of 20 divers and found s = 432.
A certain map is drawn so that a distance of 0.5 inch on the map represents 12.5 miles of actual distance. If the distance between two towns is 4.5 inches on the map, what is the actual distance, in miles, between the two towns?
The national median sales price for new single-family homes is $230,000 (The Associated Press, March 25, 2006). Assume that the following data were obtained for sales of existing single-family homes in Houston and Boston.
A study of 25 graduates of four-year colleges by the American Banker's Association revealed the mean amount owed by a student in student loans was $14,381.
A leasing firm claims that the mean number of miles driven annually, m, in its leased cars is less than 13280 miles. A random sample of 150 cars leased from this firm had a mean of 12584 annual miles driven.
Correlation between the two variables - Evaluate the value of the correlation coefficient.
Find the probability that the first ball drawn is red and the second ball drawn is green. Place your answer, rounded to 4 decimal places, in the blank.
Assume that standard deviation is $3,204 and that 36 four-year institutions are arbitarily selected. Determine the probability that sample mean cost for these 36 schools is less than $25,000.
a tennis player makes a serve 72 percent of the time. suppose the player gets 80 serves in a match.what is the mean and
Determine whether the following situations represent a right, left or two-tailed test: In 1997, 43% of Americans 18 years or older participated in some form of charity work.
a survey of 85 families showed that 36 owned at least one dvd player. find the 99 confidence interval estimate of the
the depot is using a standard of 635 hours for a particular modification effort. you are to review the standard and
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