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Get Full Access to Probability And Statistics For Engineers And The Scientists - 9 Edition - Chapter 3 - Problem 51e
Get Full Access to Probability And Statistics For Engineers And The Scientists - 9 Edition - Chapter 3 - Problem 51e

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# Refer to the previous exercise. a. What is the expected ISBN: 9780321629111 32

## Solution for problem 51E Chapter 3

Probability and Statistics for Engineers and the Scientists | 9th Edition

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Problem 51E

Refer to the previous exercise. a.? ?What is the expected number of calls among the 25 that involve a fax message? b. ?What is the standard deviation of the number among the 25 calls that involve a fax message? c. ?What is the probability that the number of calls among the 25 that involve a fax transmission exceeds the expected number by more than 2 standard deviations?

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Step 1 of 3

Answer: Step1: Refer to the previous exercise. Given, a particular telephone number is used to receive both voice calls and fax messages. Suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. Here, n = 25 and p = 25% = 0.25 Step2: a). The aim is to find the expected number of calls among the 25 that involve a fax message. The expectation of ‘x’ is E(x) = x np = 25×0.25 = 6.25 Therefore,the expected number of calls among the 25 that involve a fax message is 6.25. Step3: b). Here the aim is to find the standard deviation of the number among the...

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##### ISBN: 9780321629111

The full step-by-step solution to problem: 51E from chapter: 3 was answered by , our top Statistics solution expert on 05/06/17, 06:21PM. This full solution covers the following key subjects: among, calls, involve, fax, message. This expansive textbook survival guide covers 18 chapters, and 1582 solutions. Probability and Statistics for Engineers and the Scientists was written by and is associated to the ISBN: 9780321629111. This textbook survival guide was created for the textbook: Probability and Statistics for Engineers and the Scientists, edition: 9. Since the solution to 51E from 3 chapter was answered, more than 419 students have viewed the full step-by-step answer. The answer to “Refer to the previous exercise. a.? ?What is the expected number of calls among the 25 that involve a fax message? b. ?What is the standard deviation of the number among the 25 calls that involve a fax message? c. ?What is the probability that the number of calls among the 25 that involve a fax transmission exceeds the expected number by more than 2 standard deviations?” is broken down into a number of easy to follow steps, and 67 words.

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