ChromeFileEditViewHistory BookmarksPeopleTabWindowHelp* O 82% O eFri 9:20 AMrch in PresentationO University of Arka xO Home | Campus P xBb Announcements -Bb MyLab Student LP Do Homework - 2 xG how to take snaps(73) MacBook Pro x+A mathxl.com/Student/PlayerHomework.aspx?homeworkld=590012335&questionld=12&flushed=true&cld=6395944&back=https://www.math...Update :) lE AppsO InSite - University..O Understanding Mu..O Investing, Advice,.O My TIAA * E*TRADE FINANCI.09 Outlook Web AppG MYGED® - About t.* Free Practice Test...>>MATH 2320: Intro to Statistics and Probability - 61W - Spring 2021Angela May & | 02/12/21 9:20 AMm (2 ofHomework: 2.4 Measures of VariationSaveScore: 0.5 of 1 pt12 of 15 (15 complete)HW Score: 96.67%, 14.5 of 15 pts½ 2.4.41Question Help vThe estimated distribution (in millions) of the population by age in a certain country for the year 2015 is shown in the pie chart. Make a frequency distribution for the data. Thenuse the table to estimate the sample mean and the sample standard deviation of the data set. Use 70 as the midpoint for "65 years and over."I Under 4 years: 19.2O 5-14 years: 44,5O 15-19 years: 18.5O 20-24 years: 19.7I 25-34 years: 45.6O 35-44 years: 42.4O 45-64 years: 75.6O 65 years and over: 54.7The sample mean is x= 38.03. (Round to two decimal places as needed.)The sample standard deviation is s=(Round to two decimal places as needed.)e. All Rights ReseEnter your answer in the answer box and then click Check Answer.All parts showingClear AllCheck Answer38Slide 33 of 67English (United States)= NotesComments12A AWE Xétv..

From the given information, Class Interval Frequency, f Midpoint, x fx x2 f.x2 0-4 19.2 2 38.4…

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* Free Practice Test...
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MATH 2320: Intro to Statistics and Probability - 61W - Spring 2021
Angela May & | 02/12/21 9:20 AM
m (2 of
Homework: 2.4 Measures of Variation
Save
Score: 0.5 of 1 pt
12 of 15 (15 complete)
HW Score: 96.67%, 14.5 of 15 pts
½ 2.4.41
Question Help v
The estimated distribution (in millions) of the population by age in a certain country for the year 2015 is shown in the pie chart. Make a frequency distribution for the data. Then
use the table to estimate the sample mean and the sample standard deviation of the data set. Use 70 as the midpoint for "65 years and over."
I Under 4 years: 19.2
O 5-14 years: 44,5
O 15-19 years: 18.5
O 20-24 years: 19.7
I 25-34 years: 45.6
O 35-44 years: 42.4
O 45-64 years: 75.6
O 65 years and over: 54.7
The sample mean is x= 38.03. (Round to two decimal places as needed.)
The sample standard deviation is s=
(Round to two decimal places as needed.)
e. All Rights Rese
Enter your answer in the answer box and then click Check Answer.
All parts showing
Clear All
Check Answer
38
Slide 33 of 67
English (United States)
= Notes
Comments
12
A AWE X
étv
..

Expert Solution

Step 1

From the given information,

Class Interval	Frequency, f	Midpoint, x	fx	$x^{2}$	f. $x^{2}$
0-4	19.2	2	38.4	4	76.8
5-14	44.5	9.5	422.75	90.25	4016.125
15-19	18.5	17	314.5	289	5346.5
20-24	19.7	22	433.4	484	9534.8
25-34	45.6	29.5	1345.2	870.25	39683.4
35-44	42.4	39.5	1674.8	1560.25	66154.6
45-64	75.6	54.5	4120.2	2970.25	224550.9
65 and above	54.7	70	3829	4900	268030
Total	320.2		12178.25		617393.1

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