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81.  The table shows the percentage of total population of a city in different age group. Study the table and answer the questions.
Age Group Percent
Up to 15
16 - 25
26 - 35
36 - 45
46 - 55
56 - 65		 20.00
18.25
16.75
16.25
15.00
12.50
66 and above 1.25

If the different between the number of people in the age groups (46 - 55) and (16 - 25) is 0.975 million, then the total population (in millions) of the city is:

Discuss
Solution:
Difference = 0.975 millions
(18.25 - 15)% = 0.975 millions
3.25% = 0.975
1%=0.9753.25100%=0.9753.25×100=30 millions
82.  Study the table and answer the questions.
Height (in cm.) Numbers of Girls
Less than 140
Less than 145
Less than 150
Less than 155
Less than 160
Less than 165 		4
11
29
40
46
51

Average height (in cm) of the girls whose heights are 155 cm and above is about-

Discuss
Solution:
Take value of class interval 155 - 160 and 160 - 165 i.e. 157.5 and 162.5.
Multiply them by their respective frequency and then divide by total no. of girls.
=157.5×6+162.5×511=945+812.511=1757.511=159.8 cm
83.  Study the table and answer the questions.
Height (in cm.) Numbers of Girls
Less than 140
Less than 145
Less than 150
Less than 155
Less than 160
Less than 165 		4
11
29
40
46
51

The number of girls whose height is above 150 cm is:

Discuss
Solution:
Change into class interval
Height   No. of girls
135 - 140. . . . . 04
140 - 145. . . . . 07
145 - 150. . . . . 18
150 - 155. . . . . 11
155 - 160. . . . . 06
160 - 165. . . . . 05
∴ Required answer
= 11 + 6 + 5
= 22
84.  The following table gives zone-wise survey report of the people of a country who take coffee. Study the table and answer the questions.
Take Coffee Zone
North East West South
More than 3 times a day 410 310 700 1450
1 to 3 times a day 1220 830 1250 1120
Twice a week 1640 710 950 420
Only once a week 620 540 530 350
Never 950 430 620 50

The ratio of the total number of people surveyed who take coffee more than 3 times a day to the total number of people who do not take coffee at all is-

Discuss
Solution:
Number of people who take coffee more than 3 times a day
= 410 + 310 + 700 + 1450
= 2870
Total number of people who do not take coffee at all
= 950 + 430 + 620 + 50
= 2050
∴ Required ratio
= 2870 : 2050
= 1.4 : 1
85.  The following table gives zone-wise survey report of the people of a country who take coffee. Study the table and answer the questions.
Take Coffee Zone
North East West South
More than 3 times a day 410 310 700 1450
1 to 3 times a day 1220 830 1250 1120
Twice a week 1640 710 950 420
Only once a week 620 540 530 350
Never 950 430 620 50

The percentage of people of south zone who take coffee at least once a day close to:

Discuss
Solution:
People in south zone
= 1450 + 1120 + 420 + 350 + 50
= 3390
People who take coffee at least once a day
= 1120 + 1450
= 2570
∴ Required percentage
=25703390×100=75.811%≈75.81%
86.  The following table gives zone-wise survey report of the people of a country who take coffee. Study the table and answer the questions.
Take Coffee Zone
North East West South
More than 3 times a day 410 310 700 1450
1 to 3 times a day 1220 830 1250 1120
Twice a week 1640 710 950 420
Only once a week 620 540 530 350
Never 950 430 620 50

The percentage of people from north-west zone who take coffee only once a week is approximately.

Discuss
Solution:
People who take coffee only once a week in there zones
= 620 + 540 + 350
= 1510
∴ Required percent
=151011050×100=13.66%≈14%
87.  The following table show the world production of steel in 1920 - 1927. Study the table and answer the questions.
Year Production (in million tons)
1920 71.30
1921 43.51
1922 67.66
1923 76.23
1924 77.23
1925 88.93
1926 91.75
1927 100.17

direction image ofTable Chart chapter
The average production of steel is:

Discuss
Solution:
The average production during (1920 - 1927)
71.30+43.51+67.66+76.23+77.23+88.93+91.75+100.178
= 77.0975 million tons
≈ 77.10 million tons
88.  The following table show the world production of steel in 1920 - 1927. Study the table and answer the questions.
Year Production (in million tons)
1920 71.30
1921 43.51
1922 67.66
1923 76.23
1924 77.23
1925 88.93
1926 91.75
1927 100.17

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The difference of the production of steel in the year 1923 and 1924 is x% of 1927. Then the value of x approximately.

Discuss
Solution:
According to the question,⇒100.17×x100=(77.23−76.23)⇒x=100100.17⇒x=0.99860..%⇒x=.1%(Approx)
89.  The following table show the world production of steel in 1920 - 1927. Study the table and answer the questions.
Year Production (in million tons)
1920 71.30
1921 43.51
1922 67.66
1923 76.23
1924 77.23
1925 88.93
1926 91.75
1927 100.17

direction image ofTable Chart chapter
The ratio of production of steel in the year 1924 and 1925 to that of 1923 and 1927 is:

Discuss
Solution:
Required ratio=Production of steel in 1924+1925Production of steel in 1923+1927=77.23+88.9376.23+100.17=166.16176.4=20772205=2077:2205
90.  The following table show the world production of steel in 1920 - 1927. Study the table and answer the questions.
Year Production (in million tons)
1920 71.30
1921 43.51
1922 67.66
1923 76.23
1924 77.23
1925 88.93
1926 91.75
1927 100.17

direction image ofTable Chart chapter
The number of years during which the company has its production less than the average production during 1920 - 1927 is approximately.

Discuss
Solution:
The average production during (1920 - 1927)
71.30+43.51+67.66+76.23+77.23+88.93+91.75+100.178
= 77.0975 (million tons)
The required number of year
= 4 (1920, 1921, 1922, 1923)

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