Suppose the life span of a calculator manufactured by Texas Instruments has a normal distributionwith a mean of 54 months and a standard deviation of 8 months. The company guarantees that anycalculator that starts malfunctioning within 36 months of the purchase will be replaced by a newone. About what percentage of calculators made by this company are expected to be replaced?

Answered: Image /qna-images/answer/3f9f1945-f48f-442f-9b40-38992e5c18cc.jpg

Answered: Suppose the life span of a calculator…

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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A manufacturer knows that their items have a normally distributed lifespan, with a mean of 6.1 years, and standard deviation of 1.9 years. If 13 items are picked at random, 2% of the time their mean life will be less than how many years? Give your answer to one decimal place.
The human resources department of a consulting firm gives a standard creativity test to a randomly selected group of new hires every year. This year, 100 new hires took the test and scored a mean of 113.6 points with a standard deviation of 134. Last year, 95 new hires took the test and scored a mean of 116.4 points with a standard deviation of 16.8. Assume that the population standard deviations of the test scores of all new hires in the current year and the test socores of all new hires last year can be estimated by the sample standard deviations, as the samples used were quite large. Construct a 90 confidence interval for the difference between the mean test score , of new hires from the current year and the mean test score , of new hires from last year. Then tind the lower limit and upper limit of the 905% confidence interval. Carry your intermediate computations to at least three decimal places. Round your answeis to at least two decimal places. (If necessary, cosult a list.ot…
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if a variable has a distribution that is bell-shaped with mean 21 and standard deviation 7, then according to the Empirical Rule, what percent of the data will lie between 0 and 42?
Newborn babies: A study conducted by the Center for Population Economics at the University of Chicago studied the birth weights of 607 babies born in New York. The mean weight was 3310 grams with a standard deviation of 910 grams. Assume that birth weight data are approximately bell-shaped. Part 1 of 3 (a) Estimate the number of newborns whose weight was less than 4220 grams. Approximately of the 607 newborns weighed less than 4220 grams. Part 2 of 3 (b) Estimate the number of newborns whose weight was greater than 1490 grams. Approximately of the 607 newborns weighed more than 1490 grams. Part 3 of 3 (c) Estimate the number of newborns whose weight was between 3310 and 5130 grams. Approximately of the 607 newborns weighed between 3310 and 5130 grams. Check Answer Save For Later Submit Assignme
Solve question 9, Part A, Part B and Part C only.
A manufacturer knows that their items have a normally distributed lifespan, with a mean of 13.6 years, and a standard deviation of 1 years.If 7 items are picked at random, 6% of the time their mean life will be less than how many years?Give your answer to one decimal place.
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