A survey indicates that people use their computers an average of 4.5 years before buying a new one. The standard deviation is 0.75 years. Assume thedistribution is approximately normal.Find the proportion of computer users that use their computers for less than 2.5 years.Wtype your answer...SFind the proportion of computer users that use their computers more than 6.25 years.Previoustype your answer...#3Xed$54сrf%5Vt9A6bDELLyh&7On★8m9altOPctri?e+Next

GivenMean(μ)=4.5standard deviation(σ)=0.75

Answered: A survey indicates that people use…

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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Similar questions

A statistics professor surveys all 100 of the students in an introductory statistics lecture. The survey asks the students to estimate when they typically wake up on weekdays. The data are recorded in terms of the number of hours after midnight the students wake up. Would it be more appropriate to find a sample standard deviation or population standard deviation in this situation? Select the correct answer below: A. Sample standard deviation B. Population standard deviation
Determine whether the following graph can represent a variable with a normal distribution. Explain your reasoning. If the graph appears to represent a normal distribution, estimate the mean and standard deviation. Could the graph represent a variable with a normal distribution? Explain your reasoning. Select the correct choice below and, if necessary, fill in the answer boxes within your choice.A.No, because the graph is skewed right.B.No, because the graph is skewed left.C.No, because the graph crosses the x-axis.D.Yes, the graph fulfills the properties of the normal distribution. The mean is approximately enter your response here and the standard deviation is about enter your response here. (Type whole numbers.)
Select ALL the ways that variation in the data can be measured below. A. The mean of the data B. The mode of the data C. The interquartile range (IQR) of the data D. The standard deviation of the data E. The variance of the data F. The range of the data G. The coefficient of variation
See the picture below. Please be certain of your answer.
d. Determine the sample standard deviation. Round your answer to 2 decimal places. e. Determine the coefficient of variation.
Use a normal distribution table or a statistical calculator to answer this question. A farm produces 10,000 eggs in a day. The mean mass of an egg is 59 grams. The standard deviation is 5 grams. An egg is "extra-large" if it has a mass between 63 and 69 grams. To the nearest ten eggs, how many extra-large eggs does the farm produce in a day?
What is the relationship between the variance and the standard deviation for a sample data set? A. The standard deviation is equal to half the variance. B. The standard deviation is equal to two times the variance. C. The standard deviation is the square root of the variance. D. The standard deviation is the square of the variance.
Students in the psychology department at General State University consumes an average of 7 sodas per day with a standard deviation of 2.5. the distribution is normal. Explain how you would go about answering the following questions (include your answer to the question in your response): How many sodas would an individual at the 75thpercentile drink per day?
The estimated distribution (in millions) of the population by age in a certain country for the year 2015 is shown in the pie chart. Make a frequency distribution for the data. Then use the table to estimate the sample mean and the sample standard deviation of the data set. Use 70 as the midpoint for "65 years and over." I Under 4 years: 18.5 I 5-14 years: 39.7 O 15-19 years: 17.4 O 20-24 years: 18.7 I 25-34 years: 40.8 I 35-44 years: 36.2 I 45-64 years: 84.7 I 65 years and over: 54.7 The sample mean is x=. (Round to two decimal places as needed.) The sample standard deviation is s = (Round to two decimal places as needed.)
Find the standard deviation for the following data set. 2, 2, 2, 5, 5, 6, 6, 8, 8, 9 A. 2.49 B. 2 C. 5 D. 6.21 Which is the correct answer?
Many college admissions want to know your class percentage in addition to your grades. The grades are normally distributed. A certain university insists that a student place in at the 90th percentile. if the mean is 79.45 and the standard deviation is 5.37, what is the 90th percentile? a.88.07 b.85.01 c.86.33 d.90
It is commonly believed that the mean body temperature of a healthy adult is 98.6° F. You are not entirely convinced. You believe that it is higher than 98.6° F. The temperatures for 12 randomly selected healthy adults are shown below. Assume that the distribution of the population is normal. 100.1, 96.8, 98.7, 100, 99.1, 98.3, 97.5, 100.9, 99.1, 100, 98.1, 100.1 What can be concluded at the a = 0.05 level of significance? a. For this study, we should use Select an answer b. The null and alternative hypotheses would be: Ho: ? Ha: Select an answer Select an answer c. The test statistic O Question Help: (please show your answer to 3 decimal places.) (Please show your answer to 4 decimal places.) d. The p-value = e. The p-value is a f. Based on this, we should Select an answer the null hypothesis. g. Thus, the final conclusion is that ... There is sufficient evidence to conclude that the population mean body temperature for healthy adults is higher than 98.6° F. There is not sufficient…

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