7.. need help please An electrical firm manufactures light bulbs that have alength life with normal distribution, and a standarddeviation of a = 10 hours. A sample of size n 100 isobtained, and its sample mean is calculated to be 400hours.=Find the 99% confidence interval for the average length lifeμl.=397.424 < u < 402.576 x invalid interval notation.Find the upper 99% bound for the average length life u.402.576397.424X invalid interval notation.Find the lower 99% bound for the average length life .x invalid interval notation.Give your answer as intervals. Use - and +∞ if needed.

From the provided information,Confidence level = 99%

length life with normal distribution, and a standard deviation of o = 10 hours. A sample of size n = 100 is obtained, and its sample mean is calculated to be 400 hours. Find the 99% confidence interval for the average length life fl. = 397.424 U < 402.576 x invalid interval notation. Find the upper 99% bound for the average length life μl. 402.576 397.424 x invalid interval notation. Find the lower 99% bound for the average length life fl. x invalid interval notation. Give your answer as intervals. Use - and too if needed

length life with normal distribution, and a standard deviation of o = 10 hours. A sample of size n = 100 is obtained, and its sample mean is calculated to be 400 hours. Find the 99% confidence interval for the average length life fl. = 397.424 U < 402.576 x invalid interval notation. Find the upper 99% bound for the average length life μl. 402.576 397.424 x invalid interval notation. Find the lower 99% bound for the average length life fl. x invalid interval notation. Give your answer as intervals. Use - and too if needed

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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