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Spare servers are maintained in stock to support IT operations. A study determined that on average, there are four demands for this type of server per day. What is the probability that on a given day a spare server will be requested
(i) More than four times?
(ii) Not at all?
(iii) If 4 servers are stocked, what is the probability of not having enough on a given day?
(iv) How many spare servers need to be stocked so that the probability of not having enough on a given day is 5%
Calculated test statistic at the 5% level of significance and An airline claims that 65% of its flights depart on time.
in a sample of 50 retirees aged 60-70 the average number of jobs they had during thier lifetime was 7.2. the population
the manufacturer of the x-15 steel-belted radial truck tire claims that the mean mileage the tire can be driven before
a certain brand of candies have a mean weight of 0.8608g and a standard deviation of 0.052 bsed on a sample of a
a 6-faced die is rolled two times. let a be the event that the outcome of the first roll is greater than 4. let b be
What is the slope of the least-squares regression line of final-exam scores on pre-exam total scores in this course?
q1. consider the following time series.t 1 2 3 4 5 6 7yt 120 110 100 96 94 92 88a. construct a time series plot. what
If the scores are approximately normal with mean 544 and standard deviation 103, what minimum score would a student need in order to score in the top 10% of those taking the test?
If a distribution of test scores is normal with a mean of 78 and a standard deviation of 11, what percent of the area lies below 60?
1.at what age do babies learn to crawl? does it take longer to learn in the winter when babies are often bundled in
the fda is comparing the mean caffeine contents of two brands of cola. independent random samples of 6-oz. soda cans of
There a flu epidemic that is spreading across SF County. You are a principle and are in charge of 32 teachers. You want to plan ahead and be able to estimate how many substitute teachers the school may need during this epidemic.
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