
A First Course in Probability (10th Edition)
10th Edition
ISBN: 9780134753119
Author: Sheldon Ross
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Question

Transcribed Image Text:8.21 A soft-drink machine is regulated so that the
amount of drink dispensed averages 240 milliliters with
a standard deviation of 15 milliliters. Periodically, the
machine is checked by taking a sample of 40 drinks
and computing the average content. If the mean of the
40 drinks is a value within the interval x ± 208, the
machine is thought to be operating satisfactorily; oth-
erwise, adjustments are made. In Section 8.3, the com-
pany official found the mean of 40 drinks to be = 236
milliliters and concluded that the machine needed no
adjustment. Was this a reasonable decision?
Expert Solution

This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by stepSolved in 2 steps

Knowledge Booster
Similar questions
- A population has a mean of u = 50 and a standard deviation of a = 10. If 3 points were added to every score in the population, what would be the new values for the mean and standard deviation? O The new mean is u = 47, and the new standard deviation is a = 13. The new mean is u = 47, and the standard deviation is still a = 10. O The new mean is u = 53, and the standard deviation is still o = 10. O The mean is still u = 50, and the new standard deviation is a = 13. If every score in the population were multiplied by 2, what would be the new values for the mean and standard deviation? The new mean is µ = 100, and the new standard deviation is still a = 10. The new mean is u = 52, and the new standard deviation is o = 20. The new mean is u = 100, and the new standard deviation is a = 20. The mean is still u = 50, and the new standard deviation is o = 20.arrow_forwardThe scores on a mathematics exam have a mean of 70 and a standard deviation of 6. Find the x-value that corresponds to the z-score 5.19. O 64.8 O 121.9 O 18.1 O 101.1arrow_forwardNumber 103 part D and Earrow_forward
- Section 9.2 Homework Progress saved Done 80 8 √ ❤ ⠀ Score: 6/13 7/13 answered 35 Question 8 0/1 pt 3 2 Details In a survey, 22 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $39.2 and standard deviation of $2.9. Estimate how much a typical parent would spend on their child's birthday gift (use a 90% confidence level). Give your answers to 3 decimal places. Express your answer in the format of E. Submit Question 13arrow_forwardA population has a mean of μ = 60 and a standard deviation of σ = 12.a. For this population, find the z-score for each of the following X values.X = 69 X = 84 X = 63X = 54 X = 48 X = 45arrow_forwardNumber 101 part A, B, and Carrow_forward
arrow_back_ios
arrow_forward_ios
Recommended textbooks for you
- A First Course in Probability (10th Edition)ProbabilityISBN:9780134753119Author:Sheldon RossPublisher:PEARSON

A First Course in Probability (10th Edition)
Probability
ISBN:9780134753119
Author:Sheldon Ross
Publisher:PEARSON
