As part of a research project, the masses, m grams, of a random sample of 1000 pebbles from a certain beach were recorded. The results are summarised in the table. Mass (g) 50

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
Problem 6CST
icon
Related questions
icon
Concept explainers
Question

What is the answer for part (d) and (e)?

As part of a research project, the masses, m grams, of a random sample of 1000 pebbles from a
certain beach were recorded. The results are summarised in the table.
Mass (g)
50 < m < 150
150 < m < 200 200 <m < 250 250 < m < 350
Frequency
162
318
355
165
(a) Calculate estimates of the mean and standard deviation of these masses.
The masses, x grams, of a random sample of 1000 pebbles on a different beach were also found.
It was proposed that the distribution of these masses should be modelled by the random variable
X- N(200, 3600).
(b) Use the model to find P(150 <X< 210).
(c) Use the model to determine x, such that P(160 <X<x,)=0.6. giving your answer correct
to five significant figures.
It was found that the smallest and largest masses of the pebbles in this second sample were 112g
and 288 g respectively.
(d) Use these results to show that the model may not be appropriate.
(e) Suggest a different value of a parameter of the model in the light of these results.
Transcribed Image Text:As part of a research project, the masses, m grams, of a random sample of 1000 pebbles from a certain beach were recorded. The results are summarised in the table. Mass (g) 50 < m < 150 150 < m < 200 200 <m < 250 250 < m < 350 Frequency 162 318 355 165 (a) Calculate estimates of the mean and standard deviation of these masses. The masses, x grams, of a random sample of 1000 pebbles on a different beach were also found. It was proposed that the distribution of these masses should be modelled by the random variable X- N(200, 3600). (b) Use the model to find P(150 <X< 210). (c) Use the model to determine x, such that P(160 <X<x,)=0.6. giving your answer correct to five significant figures. It was found that the smallest and largest masses of the pebbles in this second sample were 112g and 288 g respectively. (d) Use these results to show that the model may not be appropriate. (e) Suggest a different value of a parameter of the model in the light of these results.
Expert Solution
steps

Step by step

Solved in 3 steps

Blurred answer
Knowledge Booster
Points, Lines and Planes
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, statistics and related others by exploring similar questions and additional content below.
Recommended textbooks for you
Holt Mcdougal Larson Pre-algebra: Student Edition…
Holt Mcdougal Larson Pre-algebra: Student Edition…
Algebra
ISBN:
9780547587776
Author:
HOLT MCDOUGAL
Publisher:
HOLT MCDOUGAL
Glencoe Algebra 1, Student Edition, 9780079039897…
Glencoe Algebra 1, Student Edition, 9780079039897…
Algebra
ISBN:
9780079039897
Author:
Carter
Publisher:
McGraw Hill
Big Ideas Math A Bridge To Success Algebra 1: Stu…
Big Ideas Math A Bridge To Success Algebra 1: Stu…
Algebra
ISBN:
9781680331141
Author:
HOUGHTON MIFFLIN HARCOURT
Publisher:
Houghton Mifflin Harcourt
Algebra: Structure And Method, Book 1
Algebra: Structure And Method, Book 1
Algebra
ISBN:
9780395977224
Author:
Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:
McDougal Littell