2. Suppose that the mean lifetime of a random sample of 25 batteries produced by a factory is 700 hours and a standard deviation of 20 hours. Find the probability that an average lifetime is more than 714 hours. Assume that the distribution of the lifetime is approximately normal.

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...
icon
Related questions
Topic Video
Question
Please explain.
2. Suppose that the mean lifetime of a random sample of 25
batteries produced by a factory is 700 hours and a standard
deviation of 20 hours. Find the probability that an average
lifetime is more than 714 hours. Assume that the distribution of
the lifetime is approximately normal.
Transcribed Image Text:2. Suppose that the mean lifetime of a random sample of 25 batteries produced by a factory is 700 hours and a standard deviation of 20 hours. Find the probability that an average lifetime is more than 714 hours. Assume that the distribution of the lifetime is approximately normal.
Expert Solution
steps

Step by step

Solved in 2 steps with 1 images

Blurred answer
Knowledge Booster
Research Design Formulation
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, probability and related others by exploring similar questions and additional content below.
Recommended textbooks for you
A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
Probability
ISBN:
9780134753119
Author:
Sheldon Ross
Publisher:
PEARSON
A First Course in Probability
A First Course in Probability
Probability
ISBN:
9780321794772
Author:
Sheldon Ross
Publisher:
PEARSON