Suppose that a total of 95 observations were made, and in preliminary study, 20% showed that machine was idle. What is the probability at 9.55% limit error?
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A: normal distributionμ = 26σ = 8.5
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A: given data, A small software company will bid on a major contract. It anticipates a profit of…
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Q: men are randomly selected, find the probability that they have a mean height greater than 69 inches.
A: Population mean = 68 Population standard deviation = 3.5Sample size n = 100
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- Suppose a plywood from a supplier are suspected to contain 2% that are below specifications. One thousand plywood were delivered by the supplier for the construction of form works for reinforced concrete structures. To ensure the quality of the plywood, the construction company randomly selected plywood and tested them for a specification compliance. Based on the suspected % defective plywood. a. Determine the probability that all 20 plywood will past the test. b. What is the probability that atleast 2 plywood will past the test.According to a survey, only 18% of customers who visited the web site of a major retail store made a purchase. Random samples of size 80 are selected. What is the probability that the sample proportion will have between 15% and 20% of customers who will make a purchase after visiting the web site?Suppose that a random sample of size 25 is to be selected from a population with mean 46 and standard deviation 8. What is the approximate probability that X will be more than .5 away from the population mean?
- The manager of a restaurant believes that waiters and waitresses who introduce themselves by telling customers their names will get larger tips than those who don't. In fact, she claims that the average tip for the former group is 17% while that of the latter is only 12%. If tips are normally distributed with a standard deviation of 9%. what is the probability that in a random sample of 13 tips recorded from waiters and waitresses who introduce themselves and 13 tips from waiters and waitresses who don't, the mean of the former will exceed that of the latter? Probability =5) The daily revenue at a university snack bar has records to indicate that the mean daily revenue is $2,400 and standard deviation is $600. A random sample of 81 days was selected. Find the approximate probability that the average revenue for the sample is less than $2,300.A newborn baby is classified as having Extremely Low Birth Weight (ELBW) if it weighs less than 1000 grams (g). The average weight of children with ELBW is N.d. with mean 815g and standard deviation 100g. What is the probability that a child with ELBW weighs less than 816?
- A newborn baby is classified as having Extremely Low Birth Weight (ELBW) if it weighs less than 1000 grams (g). The average weight of children with ELBW is N.d. with mean 815g and standard deviation 100g. What is the probability that an SRS of 45 children with ELBW weighs less than 810?. The demand for high-grade gasoline at a service station is normally distributed with mean 27,009 gallons per day and standard deviation 4,530. Find two values that will give a symmetric 0.98 probability interval for the amount of high-grade gasoline demanded daily.A production line in a factory, assembles laptops. A random sample of assembly time of 36 laptops has been drawn from this factory. Suppose, the population distribution has a mean assembly time of 25 minutes and standard deviation 6 minutes. What is the probability that a sample mean is 26 minutes? Select one: a. 0.0 b. =P(Z>1) c. =P(Z=0) d. =P(Z<1) e. None of the others