The lifetime of an LED bulb follows a lognormal distribution. Suppose that the mean andstandard deviation of the lifetime are 28,000 hours and 40,000 hours, respectively.a. What are the parameters and w of the lognormal distribution?b. What is the probability that the lifetime of a bulb exceeds 30,000 hours?c. Determine the lifetime that is exceeded by 95% of the bulbs.

From given data we have : μ=28000σ=40000

Answered: The lifetime of an LED bulb follows a…

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...

See similar textbooks

Similar questions

a. The mean of this distribution is b. The standard deviation is c. The probability that the the child will be older than 5 years old?
A manufacturer finds that the life expectancy of its best-selling model of dishwashers is 11 years and the standard deviation is 1 year. The lifespans are approximately normally-distributed. What percent of dishwasher models will last from 9 to 13 years? a. About 34% с. About 95% b. About 68% d. About 47.5%
Assume that a randomly selected subject is given a bone density test. Bone density test scores are normally distributed with a mean of 0 and a standard deviation of 1. Draw a graph and find P, the 11th percentile. This is the bone density score separating the bottom 11% from the top 89%. Which graph represents P ? Choose the correct graph below. O A. O B. OD. P11 P11 P11 P11 The bone density score corresponding to P1 is (Round to two decimal places as needed.) Click to select your answer(s). APR tv MacBook Air F9 F10 LLA 20 F3 F6 F8 F4 F5 F1 F2 & #3 7 8. %24
Which of the following predictions can be calculated using a geometric distribution? a. the number of expeditions that will reach the top of Mount Everest this year b. the number of trucks a weigh station will inspect before finding one that is overloaded C. both of the above d. neither of the above 31 SAMSUNG DIl 9% & 5 6 7 8. y
A population has a mean μ = 70 and a standard deviation o=36. Find the mean and standard deviation of a sampling distribution of sample means with sample size n = 81. H=(Simplify your answer.) = (Simplify your answer.)
A distribution of numbers is given by the following frequency histogram. Which of the following would be true? a. The mean would be greater than the median O b. The median would be greater than the mean C. The standard deviation would be less than 1 O d. The mean would be greater than the standard deviation
A subway train arrives every eight minutes during rush hour. We are interested in the length of time a commuter must wait for a train to arrive. The time follows a uniform distribution. a. Find the mean, μ = b. Find the standard deviation, σ = Round to the nearest tenth.
A stock has an annual expected return of 15% and a standard deviation of 50%. An investor in this stock can expect to lose 10% of their investment or more about once every _____ year(s).a. 5 b. 3 c. 4 d. 2 e. 1. Need typed answer only .Please give answer within 45 minutes
4b.) Draw the graphs. Round your final answers up to 6 decimal places, if applicable. Give the correct units.
Suppose the value of a stock varies each day from $16 to $25 with a uniform distribution. Find m.
A firm makes MP3 players. The research department at this firm found that the life of the MP3 players is normally distributed with a mean of 4900 hours and a standard deviation of 450 hours. How many playing hours should a warranty cover if the firm wants 7% of the MP3 players to be below this amount? A. 5566 B. 4234 C. 4900 D. 1.48
By studying the standard deviation fomula, given below, explain why the standard deviation of a set of data will always be greater than or equal to 0. E(x-x)? n-1 O A. The mean, x, will always be greater than or equal to 0. O B. The values of x will always be greater than or equal to 0. OC. The values of x-x will always be greater than or equal to 0.

SEE MORE QUESTIONS

Recommended textbooks for you

A First Course in Probability (10th Edition)

Probability

ISBN:

9780134753119

Author:

Sheldon Ross

Publisher:

PEARSON

A First Course in Probability

Probability

ISBN:

9780321794772

Author:

Sheldon Ross

Publisher:

PEARSON

A First Course in Probability (10th Edition)

Probability

ISBN:

9780134753119

Author:

Sheldon Ross

Publisher:

PEARSON

A First Course in Probability

Probability

ISBN:

9780321794772

Author:

Sheldon Ross

Publisher:

PEARSON

SEE MORE TEXTBOOKS