Batteries life spans are normally distributed the mean is, Ask an Expert

Statistics

Batteries' life spans are normally distributed. The mean is 2300. The standard deviation is 20 hours.

What percent of batteries have a life span of more than 2330 hours?

Is it usual or unusual for a battery to have a life span of more than 2330 hours? Why?

View complete question

Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M91014359

Have any Question?Write your Review or question?

Related Questions in Statistics and Probability

Jane must get at least three out of four problems on the

Jane must get at least three out of four problems on the exam correct to get an A. She has been able to do 60% of the problems on old exams, so she assumes that the probability she gets a given problem correct is 0.6. Sh ...

Martin enterprises needs someone to supply it with 109000

Martin Enterprises needs someone to supply it with 109,000 cartons of machine screws per year to support its manufacturing needs over the next five years, and you've decided to bid on the contract. It will cost you $740, ...

A professor records the following final exam scores 68 6 m

A professor records the following final exam scores: 68 6 (M SD). Students scoring in the top 18% get an A. What is the cutoff score for the top 18% in this example?

Many high school students take the ap tests in different

Many high school students take the AP tests in different subject areas. In 2007, of the 144,796 students who took the biology exam 84,199 of them were female. In that same year, of the 211,693 students who took the calcu ...

Among 140 subjects with positive test results there are 25

Among 140 subjects with positive test? results, there are 25 false positive? results; among 152 negative? results, there are 22 false negative results. If one of the test subjects is randomly? selected, find the probabil ...

Calculation of individual costs and wacc lang enterprises

Calculation of individual costs and WACC Lang Enterprises is interested in measur-ing its overall cost of capital. Current investigation has gathered the following data. The firm is in the 21% tax bracket. Debt The firm ...

A company is considering replacing its fleet of jets with

A company is considering replacing its fleet of jets with new ones, but only if they can reduce 5 days off the current 30 day delivery time. The company has purchased 5 new jets and done a sample of 15 trips. The sample ...

In a pre-election poll a candidate for district attorney

In a pre-election poll, a candidate for district attorney receives 304 of 600 votes. Assuming that the people polled represent a random sample of the voting population, test the claim that a majority of voters support th ...

Assume that the coin is weighted so that a tail is 6 times

Assume that the coin is weighted so that a tail is 6 times as likely as a head. The coin is flipped 9 times. 1) What is the probability that both heads and tails occur?

A social psychologist recently developed a childhood

A social psychologist recently developed a childhood memories test that is intended to measure how people recall pleasant and unpleasant memories from childhood. Scores on this test range from 1 (very unpleasant) to 100 ...

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