Question 3:Warranty records show that the probability that a new computer will need warrantyservice in the first 90 days is 0.20.a) If a sample of five computers is selected, what is the probability that one of them willrequire service in the first 90 days?b) If a sample of four computers is selected, what is the probability that one of them willrequire service in the first 90 days?

Given that, Warranty records show that the probability that a new computer will need warranty…

Answered: Warranty records show that the…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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1) Suppose that the number of days an American stays at home due to the coronavirus is N( 60,15). You sample 25 Americans. Find the probability that the average number of days that your 25 stay home . A) is greater than 65 days. B) is within 8 days of the population mean. C) How long would your 25 have to stay at home on the average in order to do more time than 41 % of all the other groups of 25 Americans.
4) Smith is a weld inspector at a shipyard. He knows from keeping track of good and substandard welds that for the afternoon shift 5% of all welds done will be substandard. If Smith checks 300 welds completed during that shift, what is the probability that he will find less than 20 substandard welds? A) 0.4066 C) 0.0934 B) 0.5934 D) 0.9066 5) The National Association of Realtors estimates that 23% of all homes purchased in 2004 were considered investment properties. If a sample of 800 homes sold in 2004 is obtained what is the probability that at most 200 homes are going to be used as investment property? A) 0.5935 C) 0.0934 B) 0.4066 D) 0.9099
8
A specific apple disease cannot be detected without dividing the apple. In a particular apple batch where the disease occurs, the probability that a random selected apple is infected is set to 0.15. 15 apples are picked random from the apple batch. What is the probability that a) none of the apples are infected. b) one or more of the apples are infected?
Suppose that on an average one mobile number is busy out of thirteen. Complete parts (a) and (b). a) If six mobile numbers are selected randomly, what is the probability that not more than three will be busy? b) If six mobile numbers are selected randomly, what is the probability that at least three of them will be busy? a) If six mobile numbers are selected randomly, the probability that not more than three will be busy is (Round your answer to four decimal places as needed.) b) f six mobile numbers are selected randomly, the probability that at least three of them will be busy is (Round your answer to four decimal places as needed.)
A group of 12 students are located in the following time zones: 3 PST, 2 MST, 2 CST, 5 EST.Four students are randomly selected from this group.a) What is the probability that they are in the same time zone?b) What is the probability that they are all in different time zones?c) What is the probability that exactly two time zones will be represented in this group?
According to CTIA, 41% of all U.S households are wireless-only households (no landline). In a random sample of 20 households, what is the probability that- a) Exactly 5 are wireless-only b) Fewer than 3 are wireless-only c) At least 3 are wireless-only d) The number of households that are wireless-only is between 5 and 7, inclusive?
One out of every 5000 individuals in a population carries a certain defective gene. A random sample of 1000 individuals is studied. a) What is the probability that exactly one of the sample individuals carries the gene? b) What is the probability that none of the sample individuals carries the gene? c) What is the probability that more than two of the sample individuals carry the gene? d) What is the mean of the number of sample individuals that carry the gene? e) What is the standard deviation of the number of sample individuals that carry the gene?
The survey by the National Center for Health Statistics further found that 49% of adults ages 25–29 had only a cell phone and no landline. We randomly select four 25–29-year-olds: a) What is the probability that all of these adults have a only a cell phone and no landline? b) What is the probability that none of these adults have only a cell phone and no landline? c) What is the probability that at least one of these adults has only a cell phone and no landline?
A Gallup poll of 1,236 adults showed that 14% believe that bad luck follows if your path is crossed by a black cat. a) Find u, o?, o, and usual values. b) Use the above information to find the probability that a total of 203 subjects believe that bad luck follows if your path is crossed by a black cat. a) Use the above information to find the probability that less than 203 subjects believe that bad luck follows if your path is crossed by a black cat.
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