Look at the following table below- lbegin array - c - c - Wline Class interval - Class mark I1Wline0-5 -1 1Whline5-10 - 11Wline10-15 -1Whine15-20 -1 1Wline array The class-mark for the first and second class intervals are-

The correct option is C 2.5, 7.5 Class mark for a class interval is given by = Upper class limit + lower class limit/2 For 1^st class interval, upper limit is ...

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Standard VIII

Mathematics

Grouped Frequency Distribution Table

Look at the f...

Question

Look at the following table below.
$\begin{matrix} C l a s s i n t e r v a l & C l a s s m a r k 0 - 5 5 - 10 10 - 15 15 - 20 \end{matrix}$

The class-mark for the first and second class intervals are:

0, 5

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2.5, 7.5

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3, 8

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5, 10

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Solution

The correct option is B
2.5, 7.5

Class mark for a class interval is given by $= \frac{Upper class limit + lower class limit}{2}$
For $1^{s t}$ class interval, upper limit is 5 and lower is 0. Thus, class mark will be 2.5.
For $2^{n d}$ class interval, upper limit is 10 and lower limit is 5. Thus, class mark will be 7.5.

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Look at the following table below.

$\begin{matrix} C l a s s i n t e r v a l & C l a s s m a r k 0 - 5 & A 5 - 10 & B 10 - 15 & 12.5 15 - 20 & 17.5 \end{matrix}$

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Look at the following table below. Class intervalClass mark0−55−1010−1515−20 The class-mark for the first and second class intervals are:

The correct option is B 2.5, 7.5 Class mark for a class interval is given by =Upper class limit + lower class limit2 For 1st class interval, upper limit is 5 and lower is 0. Thus, class mark will be 2.5. For 2nd class interval, upper limit is 10 and lower limit is 5. Thus, class mark will be 7.5.

Look at the following table below.
$\begin{matrix} C l a s s i n t e r v a l & C l a s s m a r k 0 - 5 5 - 10 10 - 15 15 - 20 \end{matrix}$

The class-mark for the first and second class intervals are: