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1. The probability that a system recovers from a rare cold spell is 0.35. If 80 systems are known to be affected by cold spell is a certain year, what is the probability that less than 40 recover?
2. Historical records of sewer pipe failures in an old city show that during the period 2005 to 2013, there were 30 failures that were catastrophic (exploded due to the build-up of methane or other gases). Assuming that the pipe failures follow a Poisson process, find the probability that
(a) 4 catastrophic failures occur within the next 6 months,
(b) the interval from now till the next catastrophic pipe failure will be at most 2 months
(c) The probability that no catastrophic pipe failure will occur in the next 12 months.
show how to copy and paste the results of the two-tailed hypothesis test on a report.show how to figure the
In how many ways can Mom assign the jobs for you to complete
Calculate separate confidence intervals for the numbers of days absent for Clinic A and Clinic B, respectively.
Suppose a simple random sample of size n = 34 is obtained from a population with μ = 30 and σ = 4. Is the sampling distribution of x approximately normal.
the lifetime in hours of a certain kind of radio tube is a random variable with the probability density function given
the distribution of heights of adult men in the u.s. is approximately normal with mean 69 inches and standard deviation
your manager who just read an abridged version of a statistics book wants you to test hypotheses for the difference in
The country clerk wants to estimate the protection of retired voters who will need special election facilities. suppose a sample of 400 retired voters was taken. If 150 special election facilities, calculate an 80% confidence for the population pr..
let x denote the number of heads obtained when a fair coin is tossed 4 times.a what is ex and varx?b repeat 10 times
a particular manufacturing design requires a shaft with a diameter between 19.88 mm and 20.018 mm. the manufacturing
Calculate the test statistic for testing the null hypothesis. The slass mean will be not be signfically different from the population mean. What is your decision about the null hypothesis?"
the amount of each active ingredient in 1 pound of each chemical are given in the file P15_74.xlsx. It is necessary that at least 100 pounds of chemical 2 be used. Determine the cheapest way of producing today's batch of NasaMist
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