Introductory Statistics
1st Edition
ISBN: 9781938168208
Author: Barbara Illowsky, Susan Dean
Publisher: OpenStax College
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Textbook Question
Chapter 7, Problem 61H
Previously; De Anza statistics students estimated that the amount of change daytime statistics students carry is exponentially distributed with a
a. In words, X = ________________
b.X
c. In words, X = _______________
d.
e. Find the
f. Find the probability that the average of the 25 students was between 50.80 and 51.00. Graph the situation, and shade in the area to be determined.
g. Explain why there is a difference in part e and pan f.
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20 km, because
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Worksheet 10
Jesse runs a small business selling and delivering mealie meal to the spaza shops.
He charges a fixed rate of R80, 00 for delivery and then R15, 50 for each packet of
mealle meal he delivers. The table below helps him to calculate what to charge
his customers.
10
20
30
40
50
Packets of mealie
meal (m)
Total costs in Rands
80
235
390
545
700
855
(c)
10.1.
Define the following terms:
10.1.1. Independent Variables
10.1.2. Dependent Variables
10.2.
10.3.
10.4.
10.5.
Determine the independent and dependent variables.
Are the variables in this scenario discrete or continuous values? Explain
What shape do you expect the graph to be? Why?
Draw a graph on the graph provided to represent the information in the
table above.
TOTAL COST OF PACKETS OF MEALIE MEAL
900
800
700
600
COST (R)
500
400
300
200
100
0
10
20
30
40
60
NUMBER OF PACKETS OF MEALIE MEAL
Let X be a random variable with support SX = {−3, 0.5, 3, −2.5, 3.5}. Part ofits probability mass function (PMF) is given bypX(−3) = 0.15, pX(−2.5) = 0.3, pX(3) = 0.2, pX(3.5) = 0.15.(a) Find pX(0.5).(b) Find the cumulative distribution function (CDF), FX(x), of X.1(c) Sketch the graph of FX(x).
Chapter 7 Solutions
Introductory Statistics
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De Anza statistics students estimated...Ch. 7 - Suppose that the distance of fly balls hit to the...Ch. 7 - According to the Internal Revenue Service, the...Ch. 7 - Suppose that a category of world-class runners are...Ch. 7 - The length of songs In a collectors [runes album...Ch. 7 - In 1940 the average size of a U.S. farm was 174...Ch. 7 - Determine which of the following are true and...Ch. 7 - The percent of fat calories that a pet-son m...Ch. 7 - The distribution of income in son Third World...Ch. 7 - Which of the following is NOT TRUE about the...Ch. 7 - The cost of unleaded gasoline in the Bay Area once...Ch. 7 - Which of the following is NOT TRUE about the...Ch. 7 - Suppose that the duration of a particular type of...Ch. 7 - Suppose that the weight of open boxes of cereal in...Ch. 7 - Salaries for teachers in a particular elementary...Ch. 7 - The attention span of a two-year-old is...Ch. 7 - The closing stock prices of 35 U.S. semiconductor...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following information to answer the next...Ch. 7 - Use the following (0 answer the next two...Ch. 7 - Use the following (0 answer the next two...Ch. 7 - Suppose In a local Kindergarten through 12th grade...Ch. 7 - Four friends, Janice. Barbara, Kathy and Roberta,...Ch. 7 - XN (60, 9). Suppose that you form random samples...Ch. 7 - Suppose that the length of research papers is...Ch. 7 - Salaries for teachers In a particular elementary...Ch. 7 - The average length of a maternity stay In a U.S....Ch. 7 - For each problem. wherever possible, provide...Ch. 7 - Men have an average weight of 172 pounds with a...Ch. 7 - M&M candies large candy bags have a claimed net...Ch. 7 - The Screw Right Company claims their 34 inch...Ch. 7 - Your company has a contract to perform preventive...Ch. 7 - A typical adult has an average IQ score of 105...Ch. 7 - Certain coins have an average weight of 5.201...
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