1 Mark Question

Question 11 Mark

The ages of workers in a certain factory are given in the following table.

Age (Year)	19	21	25	27	30
Workers	5	15	13	15	7

Find the mode of their ages.

Answer

Here the maximum frequency is 15; but this is the frequency is of two observations.
∴ Mode = 21 and 29 ∴ mode for ages is 21 years and 29 years.

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Question 21 Mark

Find the mean of numbers 25, 30, 27, 23 and 25.

Answer

$\frac{25+30+27+23+25}{5}=\frac{130}{5}=26$

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Question 31 Mark

Find the mode of the following data.

Answer

Here, the maximum frequency is 9.
Since, Mode = observations having maximum frequency
But, this is the frequency of two observations.
∴ Mode = 35 and 37

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Question 41 Mark

In the following table, the information is given about the number of families and the siblings in the families less than 14 years of age. Find the mode of the data.

Answer

Here, the maximum frequency is 25.
Since, Mode = observations having maximum frequency
∴ The mode of the given data is 2.

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Question 51 Mark

Find the class-mark of the class $35-40.$

Answer

Class-mark
$=\frac{\text { Lowerclass limit }+ \text { Upper class limit }}{2}$
$=\frac{35+40}{2}$
$=\frac{75}{2}$
$=37.5$
$\therefore$ Class-mark of the class $35 – 40$ is $37.5$

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Question 61 Mark

For class interval 20 – 25 write the lower class limit and the upper class limit.

Answer

Lower class limit = 20
Upper class limit = 25

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