Question on probability based on z score

Assignment Help Basic Statistics
Reference no: EM13102613

A normal distribution has a mean of 80 and a standard deviation of 14. Determine the value above which 80 percent of the values will occur.

Reference no: EM13102613

Questions Cloud

Z-score corresponding to the sample mean : Suppose you take a sample of size 100 of test scores and find that the mean is 63. What is the z-score corresponding to this sample mean?
Determining health insurance package : The Food King Chain employs more than 3,000 people. The worker's ages are approximately normally distributed, with a mean of 31 years and a standard deviation of 4.3 years.
Data from a random sample of households : A cell phone company collects data from a random sample of 500 households. The results indicate that 135 of the households would add an extra cellular number, provided it was offered at a reduced monthly cost.
Explain techbiques to effective writing and speaking skills : Recognize at least three errors affecting truth and validity in arguments for your topic. Sum-up the steps you completed while estimating both sides of your topic.
Question on probability based on z score : A normal distribution has a mean of 80 and a standard deviation of 14. Determine the value above which 80 percent of the values will occur.
Information about calculating binomial probabilities : Two-liter plastic bottles used for bottling cola are shipped in lots of 100. Suppose the lots are 5 percent defective. Some bottles leak, some are too small, and so forth.
Basics of population mean waiting time : At the 0.05 level of significance, is there evidence to suggest that the population mean waiting time to check out is less than 10.73 minutes?
Explanation to binomial probability : An unprepared student takes a three-question, true/false quiz in which he guesses the answers to all three questions, so each answer is equally likely to be correct or wrong.
Estimate the difference in the mean bmi between boys-girls : An investigator wants to design a study to estimate the difference in the mean BMI between boys and girls age 12 living in new york city. How many boys and girls are needed to ensure 95% confidence interval estimate for the difference in mean BMI ..

Reviews

Write a Review

Basic Statistics Questions & Answers

  Determining value of statistic and probability value

Are number of toilet breaks and amount of beverage consumed related?  Describe how? Provide the value of statistic and probability value.

  Illustrate what is the criterion of realism value

Criterion of realism or Hurwitz. Assume that the payoff from an investment depends on market conditions. Illustrate what is the criterion of realism value.

  Uniform distribution over the interval

If we assume that the errors made by rounding off are iid and have a uniform distribution over the interval ( - ~, ~), compute approximately the probability that the sum of the integers is within two units of the true sum.

  Fit of a regression equation to the data

What terms describe the fit of a regression equation to the data? What is the practical use of the regression equation in the real world? Explain with some examples.

  Evaluate the p-value

The null hypothesis is that the distribution of mother's educational level is the same for both treatment groups. The value of the chi-square statistic is 7.422. Evaluate the P-value

  Anova for rate of return

Suppose a stock analyst wants to determine whether there is a difference in the mean rate of returns for three types of stock - utility, retail, and banking.

  Normal distribution of diameters of grapefruits

The diameters of grapefruits in certain orchard are normally distributed with mean of 6.95 inches and a standard deviation of 0.75 inches. Show all work.

  Competing for customers

First National Bank and City National Bank are competing for customers who would like to open IRAs. 32 weeks are randomly selected for First National Bank and another 32 weeks are randomly selected for City National.

  Degrees of freedom related with critical t-value

Two independent samples of sizes 16 and 26 were taken. In a test of equality of population means of the two samples, how many degrees of freedom are associated with the critical t-value?

  The price and the quality rating score of rare-projection

Costs of Televisions Listed below are prices (in dollars) and quality rating scores of rare-projection televisions (based on data from Consumer Reports). All of the televisions have screen sizes of 55 in or 56 in.

  Average response times of fire departments to fire calls

The Federal Government is stepping up efforts to reduce average response times of fire departments to fire calls. The distribution of mean response times to fire calls follows a normal distribution with a mean of 12.8 minutes and a standard deviat..

  Sample mean and standard deviation

Shows a sample mean of 1,261 with a standard deviation of 59. Should Pennsylvania adopt the new system for all toll roads in the state?

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