If light bulbs have lives that are normally distributed, Ask an Expert

Statistics

If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, what percentage of light bulbs have a life less than 2500 hours? I know the answer is 50% but once you determine the z=0 how do you show you got to .50 or 50%?

View complete question

Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M9103838

Have any Question?Write your Review or question?

Related Questions in Statistics and Probability

You are lost on the mythy island in the summer when

You are lost on the Mythy Island in the summer, when tourists are two-thirds of the population. If you ask a tourist for direction the answer is correct with probability ¾; answers to repeated questions are independent e ...

Suppose that the height x in inches of a 20 year old man is

Suppose that the height (x), in inches of a 20 year old man is a normal random variable with a mean of 70 inches and standard deviation of 5.102 inches. What is the 97.5th percentile of all 20 year old men's heights?

If you flip five coins what is the probability that you

If you flip five coins what is the probability that you will get at least three heads?

A data firm records a large amount of data

A data firm records a large amount of data. Historically, 1.0% of the pages of data recorded by the firm contain errors. If two hundred pages of data are randomly selected? a. What is the probability that six or more pa ...

According to a survey of 25000 households 55 of the people

According to a survey of 25,000 ?households, 55 % of the people watching a special event on TV enjoyed the commercials more than the event itself. Complete parts a through e below based on a random sample of nine people ...

Question suppose x is a normally distributed random

Question: Suppose X is a normally distributed random variable with mean µ = 200 and standard deviation σ = 20 a. Sketch the probability density function of X¯. On the same graph, sketch the probability density function o ...

Question 1co6 from a random sample of 68 businesses it is

Question 1 (CO6) From a random sample of 68 businesses, it is found that the mean time that employees spend on personal issues each week is 4.9 hours with a standard deviation of 0.35 hours. What is the 95% confidence in ...

A researcher selects from a participant pool of 8 males and

A researcher selects from a participant pool of 8 males and 11 females. He determines that the probability of selecting 2 female participants is p = .335. Based on this probability, what strategy did the researcher use t ...

According to national data about 14 of american college

According to national data, about 14% of American college students earn a graduate degree. Using this estimate, what is the probability that exactly 24 undergraduates in a random sample of 200 students will earn a colleg ...

A business analyst in the washington dc area looked at the

A business analyst in the Washington, D.C. area looked at the following Christmas 2016 and 2017 toy sales in Metro D.C. Six toy stores were were contacted and shared the following information where x is 2016 sales and y ...

4,153,160 Questions Asked
13,132 Experts
2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Recent Questions

Ask Statistics and Probability Expert