Find probability that fifteen light bulbs have life time

Assignment Help Basic Statistics

Reference no: EM13137712

Find the probability that 15 light bulbs each having life time normally distributed with a mean of 3 months and a standard deviation of 1 month will have a total lifetime of at least 45 months if all of the bulbs are used non stop.

Reference no: EM13137712

Questions Cloud

Develop approximate confidence interval for population mean : A random sample of 49 employees took a computer literacy test. The sample resulted in a mean score of 75 with a standard deviation of 21. Develop an approximate 95% confidence interval for the population mean of the 600 employees.

Strategic objectives of the national strategy : What are the strategic objectives of the National Strategy for Homeland Security and what are the "critical missions" in achieving these strategic objectives?

Calculate limits within which weight of packets lie : Calculate the limits within which the weight of the packets should lie assuming that the machine is not been classified as faulty.

Who are the stakeholders in decision : Part (a) Who are the stakeholders in this decision? Part (b) Is it ethical for Judy to revise the costs as indicated? Briefly explain. Part (c) What should Judy do?

Find probability that fifteen light bulbs have life time : A standard deviation of 1 month will have a total lifetime of at least 45 months if all of the bulbs are used non stop.

Why ending inventory figure should be extremely accurate : As the accounting manager, write a memo to Mr. Talbott, explaining why the ending inventory figure should be extremely accurate, with as little slack as possible.

Explain random variable of approximately normal distribution : A simple random sample of 400 trees is selected, and the sample mean age of these trees is computed. We know the random variable has an approximately normal distribution because of?

What is stan realized gain on the sale : How would your answer to Part a. change, if at all, if the FMV of the gift property was $85,000 as of the date of the gift.

What mass of f2 is needed : What mass of F2 is needed to produce 205 g of PF3 if the reaction has a 79.3% yield?

User Account

All Pages