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# 20 marks] In the old days, there was probability 0.8 of success in any attempt to make long-distance telephone call Suppose 1800 calls came into the exchange: Use...

## Question

###### 20 marks] In the old days, there was probability 0.8 of success in any attempt to make long-distance telephone call Suppose 1800 calls came into the exchange: Use normal approximation of the binomial to calculate the probability that the number of long-( distance calls are between 1400 and 14502[20 marks] The mean water pressure in the main water pipe from & town well should be kept at 56 psi Anything less and several homes will have an insufficient supply; and anything greater could burs

20 marks] In the old days, there was probability 0.8 of success in any attempt to make long-distance telephone call Suppose 1800 calls came into the exchange: Use normal approximation of the binomial to calculate the probability that the number of long-( distance calls are between 1400 and 14502 [20 marks] The mean water pressure in the main water pipe from & town well should be kept at 56 psi Anything less and several homes will have an insufficient supply; and anything greater could burst the pipe: Suppose the water pressure is checked at 47 random times The sample mean is 57.1. (Assume 0 7.) Is there any evidence to suggest the mean water pressure is different from 562 Use & = 0.01. [10 marks] mnajor car manufacturer wants t0 test new engine to determine whether it meets new air- ~pollution standards. The mean emission of all engines of this type must be less than 22 parts per million of carbon_ 10 engines are manufactured for testing purposes and the mean and standard deviation of the emissions for this sample of engines are determnined to be I 18.6 parts per million, 3.5 parts per mnillion_ At & = 0.01 level of significance; do the data provide sufficient evidence to allow the manufacturer to conclude that this type of engine meets the pollution standard? Assume normality: 20 marksl Using ` least square method, find the line of best fit for the following set of 9 data points: (90, 94) , (67 , 75) , (50, 54) ; (89, 90) , (30, 60), (75, 82) ; (80, 90) ; (70, 85) , (83,88)  #### Similar Solved Questions

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The number of entrees purchased in single order at a Noodles & Company restaurant has had an historical average of 1.25 entrees per order: On a particular Saturday afternoon, random sample of 38 Noodles orders had a mean number of entrees equal to 45 with a standard deviation equal to 0.62. At t...
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