CNNBC recently reported that the mean annual cost of auto insurance is 958 dollars. Assume the standarddevíation is 150 dollars. You will use a simple random sample of 83 auto insurance policies.Find the probability that a single randomly selected policy has a mean value between 951.4 and 990.9dollars.P(951.4 < X < 990.9) =83 has a mean value between 951.4 and 990.9Find the probability that a random sample of size n =dollars.P(951.4 < M < 990.9) =Enter your answers as numbers accurate to 4 decímal places.Question Help: O Video O Message instructorSubmit Question

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Answered: CNNBC recently reported that the mean…

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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Business Weekly conducted a survey of graduates from 30 top MBA programs. On the basis of the survey, assume the mean annual salary for graduates 10 years after graduation is 177000 dollars. Assume the standard deviation is 43000 dollars. Suppose you take a simple random sample of 83 graduates. Find the probability that a single randomly selected salary that doesn't exceed 181000 dollars. Answer = Find the probability that a sample of size 83 is randomly selected with a mean n that that doesn't exceed 181000 dollars. Answer = Enter your answers as numbers accurate to 4 decimal places.
construct the normal model for data with a mean of 57 and a standard deviation of 6. Show the 68-95-97.7 rule on the model.
In a bell-shaped distribution, 95 % of the data falls within 1 standard deviation of the mean.
The distribution for the time a patient of a medical center spends waiting for an appointment is normal with mean of 35 minutes and standard deviation of 12 minutes. What wait times represents the middle 55% of all appointments?
Assume that adults have IQ scores that are normally distributed with a mean of 96.9 and a standard deviation of 17.3. Find the probability that a randomly selected adult has an IQ greater than 116.5.
In 2021, the CDC estimated the mean height of U.S. women aged 20 years old and over was 63.5 inches with a standard deviation of 5.2 inches. (https://www.cdc.gov/nchs/fastats/body-measurements.htm) What is the expected mean for a sample of 150 women? What is the standard deviation of the mean for a sample of 150 women? What is the probability of 150 women having a sample mean below 60 inches? What is the probability of 150 women having a sample mean above 65 inches? What is the probability of 200 women having a sample mean below 60 inches? Notice the change in sample size. What is the probability of 200 women having a sample mean above 65 inches?
A banker finds that the number of times people use automated-teller machines (ATMs) in a year are normally distributed with a mean of 40.0 and a standard deviation of 11.2 (based on data from Maritz Marketing Research, Inc.). Find the proportion of customers who use ATMs between 20 and 60 times. Use four decimal places for your answer
The distribution for the time a patient of a medical center spends waiting for an appointment is normal with mean of 35 minutes and standard deviation of 12 minutes. What proportion of patients will wait more than 47 minutes for an appointment?
CNNBC recently reported that the mean annual cost of auto insurance is 1026 dollars. Assume the standard deviation is 252 dollars, and the cost is normally distributed. You take a simple random sample of 38 auto insurance policies. Round your answers to 4 decimal places.
A random sample of 47 cars in the drive-thru of a popular fast food restaurant revealed an average bill of $17.51 per car. The population standard deviation is $6.05. Estimate the mean bill for all cars from the drive thru with 91% confidence.
A fair coin is flipped 100 times . Find the mean and standard deviation for the number of tails for this distribution.
According to the Department of Education the mean number of hours college students spend studying each week follows a normal distribution with a mean of 20 hours and a standard deviation of 9 hours. What ‘hours of study’ represent the 90th percentile? What ‘hours of study’ represent the 15th percentile?

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