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Standard VIII

Mathematics

Representing Data Using Tally Marks

A class has 2...

Question

A class has 20 students whose ages (in years) are as follows:

14, 13, 14, 15, 12, 13, 13, 14, 15, 12, 15, 14, 12, 16, 13, 14, 14, 15, 16, and 12.

Find the mean age of these students.

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Solution

To find the mean, let's first draw the frequency table.

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Q. The ages of students of 10^th class, in a school are as follows. The ages are given in years months.

14

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6, 13

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11, 15

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2, 16

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0, 13

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9, 14

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5, 14

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0, 15

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1, 16

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2, 14

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1, 13

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8, 14

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4, 15

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4, 15

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1, 14

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10, 14

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8

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1, 14

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1, 16

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0, 13

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10, 14

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0, 15

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0, 13

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6, 13

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11,
14

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3, 14

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8, 14

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7, 14

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8, 14

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1, 15

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0, 15

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4,
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9, 14

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9, 14

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3, 14

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10, 13

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2, 15

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1,

Prepare a grouped frequency distribution table (classes; 13

-

14, 14

-

15, 15

-

16, ....)

Draw frequency distribution table and bar graph for the following data :

Ages(in years) of students in a class:

$14, 13, 12, 13, 14, 15, 13, 14, 16, 15, 14, 13, 12, 12, 12, 13, 13, 13, 13, 15, 14, 14, 13, 13, 12, 12, 12, 15, 14, 12, 12, 13, 13, 14, 12, 16,$

$16, 13, 13, 12, 14, 14$

The following are the ages ( in years) of 25 students of a class.

Prepare a table using tally marks and then draw a pictograph using 1 for 2 students.

$15, 13, 16, 12, 14, 15, 16, 13, 12, 14, 16, 16, 15, 12, 11, 15, 16, 13, 12, 14, 15, 15, 12, 11, 16$

The marks of

20

students in a test were as follows:

5, 6, 8, 9, 10, 11, 11, 12, 13, 13, 14, 14, 15, 15, 15, 16, 16, 18, 19, 20.

The mean is

The marks of

20

students in a test were as follows:

5, 6, 8, 9, 10, 11, 11, 12, 13, 13, 14, 14, 15, 15, 15, 16, 16, 18, 19, 20

The mode is

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A class has 20 students whose ages (in years) are as follows:​ 14, 13, 14, 15, 12, 13, 13, 14, 15, 12, 15, 14, 12, 16, 13, 14, 14, 15, 16, and 12. ​ Find the mean age of these students.

To find the mean, let's first draw the frequency table.

A class has 20 students whose ages (in years) are as follows:

14, 13, 14, 15, 12, 13, 13, 14, 15, 12, 15, 14, 12, 16, 13, 14, 14, 15, 16, and 12.

Find the mean age of these students.