An electrical firm manufactures light bulbs that have a life, before burn-out, that is normallydistributed with mean equal to 750 hours and a standard deviation of 60 hours.a. Find the probability that a bulb burns out after 770 hours.b. Find the probability that a bulb burns out before 734 hours.c. Find the probability that a bulb burns out between 712 and 743 hours.UasGRAlevet to otthat thmanmen GRA orhaof31125.x2

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Answered: An electrical firm manufactures light…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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On average, TV crash after 109,000 hours of continuous use. Although the time for the TV to crash is random, researchers have found that the duration until the TV crashes follows an exponential probability distribution. e. What is the probability of a TV crash with a duration of use between 17,000 and 50,000 hours?f. What is the mean and standard deviation of the duration of the TV crash?
Q6- Assume the probability that a maple tree at age 5 grows less than 140 cm is equal to 0.2. If the height of maple trees at age 5 are estimated to be normally distributed with mean ? cm and variance 81 cm. find ?.
A civil engineer takes a public ride going to his firm. The average time for his trip is 24 minutes, with a standard deviation of 3.80 minutes. Find the probability that 2 of the next 3 trips will take at least 1/2 hour. Choices: a. 0.3974 b. 0.0571 c. 0.0092 d. 0.0004
An automatic machine in a manufacturing process is operating properly if the lengths of an important subcomponent are normally distributed with a mean of 110 cm and a standard deviation of 5.5 cm. A. Find the probability that if 3 subcomponents are randomly selected, their mean length exceeds 112 cm. Probability = B. Find the probability that if 3 are randomly selected, all 3 have lengths that exceed 112 cm. Probability =
A certain brand of car tends to break down on average after 115,000miles with a standard deviation of 4800 miles. If 36 cars of this brand are sampled,find the probability that their average breakdown mileage is less than 113,500miles. a. 0.0301 b. 0.3783 c. 0.6217 d. 0.9699
Susan jogs to the park each day and the trip takes an average of µ = 22 minutes. The distribution of jog times is approximately normal with a standard deviation of σ = 10 minutes. For a randomly selected day, what is the probability that Susan’s jog to the park will take less than 16 minutes? Select one: a. 0.2743 b. 0.8957 c. 0.3236 d. 0.7554
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The average number of pounds of red meat a person consumes each year is 196 with a standard deviation of 22 pounds (Source: American Dietetic Association). If a sample of 50 individuals is randomly selected, find the probability that the mean of the sample will be greater than 200 pounds. OA. 0.0985 OB. 0.9015 OC. 0.8815 O D. 0.7613 C
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The NJ Department of Health has reported the average life span of NJ residents is 81 years. If the standard deviation is σ = 4 years, what is the probability of a person living to at least 92 years of age?

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