Describing z-score within standard deviations of mean

Assignment Help Basic Statistics
Reference no: EM1319630

Q1) Life span of battery is normally distributed; with mean of 2400 hours and standard deviation of 40 hours .What percent of batteries have life span that is more than 2470 hours? Would it be unusual for a battery to have a life span which is more than 2470 hours? Describe your reasoning

What percent of batteries have a life span that is more than 2470 hours

Approximately ......% of batteries have a life span which is more than 2470 hours

Would it be unusual for a battery thave a life span that is more than 2470 hours? Describe your reasoning

a) It is unusual for battery to have a life span that is more than 2470 hours as the z-score is within 2 standard deviations of mean.

b) It is unusual for battery to have a life span that is more than 2470 hours as the z-score is not within 2 standard deviations of mean.

c) It is not unusual for battery to have life span that is more than 2470 hours as the z-score is not within 2 standard deviations of mean.

d) It is not unusual for a battery to have life span that is more than 2470 hours as the z-score is  within 2 standard deviations of mean.

Reference no: EM1319630

Questions Cloud

Xbar distribution of sample means : If random sample of size n = 16 are selected, can we say anything about the xbar distribution of sample means?
Standardized test is randomly selected for probability : A student with a 3.5 to 4 grade point average who took standardized test is randomly selected. Determine the probability that students test score is less than 36.
Objective questions on regression : Objective questions on regression
Probability distribution of x : What can we say about the probability distribution of x? Is it approximately normal? What are the mean and standard deviation?
Describing z-score within standard deviations of mean : It is not unusual for a battery to have life span that is more than 2470 hours as the z-score is  within 2 standard deviations of mean.
Probability in book seller : USA Today reported that 11% of all books sold are of the romance genre. If a local bookstore sells 316 books on a given day, what is the probability that
Multiple choice questions on regression : Multiple choice questions on regression.
Explaining independent variable-covariate and levels : Explain the independent variable, covariate, and levels (groups) of eah. Also, explain the dependent variable and its associated measurement scale and expected outcome.
Probability in case of style of pottery : Santa Fe black on white is a style of pottery that occurs in about 61% of the pot shards found in the Bandelier National Monument area.

Reviews

Write a Review

Basic Statistics Questions & Answers

  Scatter plot for variation in starting salaries

Based on this sample information find out what percent of variation in starting salaries is described by GPA, and find out the equation that would forecast salary from GPA. Give a scatter plot.

  Determining confidence interval for the mean price

Find the confidence interval for the mean price, μ, of all dealer sticker prices of new cars: for a confidence level of 90% in thousands of dollars:

  Computing critical values by null and alternative hypotheses

By constructing null and alternative hypotheses, computing critical values, and comparing test statistic to critical value.

  Illustrate the maximum number of reservations

Illustrate the maximum number of reservations that it could accept for a flight with a capacity of 160, if it needs the probability of accommodating all reservation holders to be at least 95%.

  Probability and poisson distribution

In order to test the assumption of a Poisson distribution, a random sample of 150 ten-minute intervals was taken.

  Hypothesis test using p-value

write down the hypothesis the test used the p-value and the interpretation then hand calculates a 95% CL for the odds ratio estimate on this last test.

  Probability based on normal distribution and empirical rule

Assuming we can verify that the data set is approximately normally distributed, what percentage of times will the server be down less than 24 minutes?

  First part of this theorem allows a problem solver

First part of this theorem allows a problem solver to compute probabilities about sample means regardless of whether a population is normally distributed.

  Assume that 60 percent of the voters in a particular region

Assume that 60 percent of the voters in a particular region support a candidate. Find the probability that a sample of 1,000 voters will yield a sample proportion in favor of the candidate within 4 percentage points of the actual proportion.

  Hypothesis testing for single proportion

Be sure the appropriate assumptions and conditions are satisfied before you proceed.

  Determine population average-confidence interval

Find a 90% confidence interval for the population average µ of the percentage of hospitals providing at least some charity care.

  Concept of probability using poisson

What is the probability that a particular driver had exactly two speeding violations?

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd