The frequency for class mark 42.5 is?

145

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129

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Solution

The correct option is D
16

From the given histogram the following frequency table can be constructed.

$\begin{matrix} Class Marks & Class Interval & Cumulative Frequency & Frequency 12.5 & 10 - 15 & 12 & 12 17.5 & 15 - 20 & 29 & 17 22.5 & 20 - 25 & 51 & 22 27.5 & 25 - 30 & 78 & 27 32.5 & 30 - 35 & 108 & 30 37.5 & 35 - 40 & 129 & 21 42.5 & 40 - 45 & 145 & 16 \end{matrix}$

(29 - 12 = 17)
(51 - 29 = 22)
(78 - 51 = 27)
(108 - 78 = 30)
(129 - 108 = 21)
(145 - 129 = 16)

From the table it is observed that the frequency for class marks 42.5 is 16.

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Similar questions

What is the frequency for class mark 42.5 ?

Marks (Class marks)	70	80	90	100
No. of Students (Frequency)	25	41	7	13

Class marks (Marks)	150	160	170	180	190	200
No. of Students	23	14	16	11	21	15

The frequency polygon of a frequency distribution is shown below.

Answer the following about the distribution from the histogram.

(i) What is the frequency of the class interval whose class mark is 15?

(ii) What is the class interval whose class mark is 45?

(iii) Construct a frequency table for the distribution.

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