Taxes: The Internal Revenue Service reports that the mean federalincome tax paid in the year 2010 was $8040. Assume that the standarddeviation is $4700. The IRS plans to draw a sample of 1000 tax returns tostudy the effect of a new tax law.Part: 0 / 5Part 1 of 5(a) What is the probability that the sample mean tax is less than $800? Round the answer to at least four decimal places.The probability that the sample mean tax is less than $8000 isX

Mean()=$8040Population standard deviation()=$4700Sample size(n)=1000

Answered: Taxes: The Internal Revenue Service…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Part 1) Amount of Sleep A sleep study administered to U.S. adults showed that the amount of sleep (in hours) they get in a 24-hour period is normally distributed with a mean of 6.5 hours and a standard deviation of 1.25 hours. Use normal probability calculations to answer the following questions. Show your calculator functions or Excel commands to receive full credit. Round your answers to 4 decimals. 1. A) How many hours of sleep did you get last night (round to the nearest quarter of an hour)? ____________ B) Ask an adult friend or a family member how many hours of sleep he/she got last night (round to the nearest quarter of an hour). Report below. Make sure it is different than your sleep amount. ____________ 2. What is the probability that a randomly selected U.S. adult slept less than your friend or family member did last night? 3. What is the probability that a randomly selected U.S. adult slept more than you did last night? 4. Doctors recommend 8 hours of…
Salaries for teachers in a particular elementary school district are normally distributed with a mean of $41,000 and a standard deviation of $5,100. We randomly survey ten teachers from that district. (Round your answers to the nearest dollar.) (a) Find the 90th percentile for an individual teacher's salary.$ (b) Find the 90th percentile for the average teacher's salary. $
Hi please answer letters a, b and c. Thank you!
Suppose babies born in a large hospital have a mean weight of 3316 grams, and a standard deviation of 324 grams. If 83 babies are sampled at random from the hospital, what is the probability that the mean weight of the sample babies would be less than 3267 grams? Round your answer to four decimal places. G Answer How to enter your answer (opens in new window) Tables Keypad Keyboard Shortcuts
Watch your cholesterol: The mean serum cholesterol level for U.S. adults was 204, with a standard deviation of 42.5 (the units are milligrams per deciliter). simple random sample of 112 adults is chosen. Use the TI-84 calculator. Round the answers to four decimal places. Part 1 of 3 What is the probability that the sample mean cholesterol level is greater than 212? The probability that the sample mean cholesterol level is greater than 212 is Part 2 of 3 What is the probability that the sample mean cholesterol level is between 192 and 202? The probability that the sample mean cholesterol level is between 192 and 202 is Part 3 of 3 Would it be unusual for the sample mean to be less than 197? It (Choose one) v be unusual for the sample mean to be less than 197, since the probability is
Response time is an important statistic for measuring the effectiveness of a fire department, and is measured as the difference between the time a fire house receives a call and the time the first piece of fire equipment leaves the station. The response times for fire departments in a large city are found to have an approximately Normal distribution, with a mean of 4.5 minutes and a standard deviation of 1.2 minutes. What percentage of fire station response times are between 4 and 6 minutes? Find the z-table here. O37.7% O 44.3% O 55.7% Save and Exit Next Submit Mark this and return 7 8 y k %24
Consider the data set. 2, 6, 7, 8, 9 (a) Find the range. (b) Use the defining formula to compute the sample standard deviation s. (Round your answer to two decimal places.) (c) Use the defining formula to compute the population standard deviation ?. (Round your answer to two decimal places.)
The cost of 5 gallons of ice cream has a standard deviation of 7 dollars with a mean of 39 dollars during the summer. What is the probability that the sample mean would be less than 40.2 dollars if a sample of 188 5-gallon pails is randomly selected? Round your answer to four decimal places. Answer How to enter your answer (opens in new window) Tables Key Keyboard Sho
TOPIC: Standard Deviation Answer all with complete solutions!
Find the probability that x will be less than 30. Round the answer to at least four decimal places. The probability that x will be less than 30 is…
Watch your cholesterol: The mean serum cholesterol level for U.S. adults was 203, with a standard deviation of 41.7 (the units are milligrams per deciliter). A simple random sample of 113 adults is chosen. Use the TI-84 calculator. Round the answers to four decimal places. Part 1 of 3 What is the probability that the sample mean cholesterol level is greater than 211? The probability that the sample mean cholesterol level is greater than 211 is Part 2 of 3 What is the probability that the sample mean cholesterol level is between 193 and 201? The probability that the sample mean cholesterol level is between 193 and 201 is Continue X x 5 Submit Assignment Espe l 7
SAT Scores: Assume that in a given year the mean mathematics SAT Score was 572, and the standard deviation was 127. A sample of 72 scores is chosen. Use the TI-84 Plus calculator. Part 1 of 5 (a) What is the probability that the sample mean score is less than 567? Round the answer to at least four decimal places. The probability that the sample mean score is less than 567 is Part 2 of 5 (b) What is the probability that the sample mean score is betvgen 537 and 580? Round the answer to at least four decimal places. The probability that the sample mean score is between 537 and 580 is

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