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Frequency Pol...

Frequency Polygon

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Q.

The following figure shows a histogram and corresponding frequency polygon. The data shows the number of victims suffering from a disease 'X' in various months of 2012.

Identify the correct statement(s) among the following.

The area under the frequency polygon is equal to the sum of areas of all bars of the histogram.
Least number of victims are seen in February.
June has the highest number of victims.
The frequency graph is incorrect.

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Q.

The graph below shows the ages of presidents of a country at the time of inauguration or the start of their tenure.

Find the correct option(s) among the following.

The youngest president was 44 years old
The total number of presidents is 45.
The youngest president was 39 years old.
The oldest president is 74 years old.

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Q.

State true or false.
To complete the frequency polygon plot we assume a class interval with frequency zero and add one before and one after the given class intervals

True
False

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Q. Match the two columns

\begin{matrix} C o l u m n - I & C o l u m n - I I (A) T h e c l a s s m a r k o f t h e c l a s s i n t e r v a l & (p) 13 145 - 150 i s (B) I n a f r e q u e n c y d i s t r i b u t i o n, t h e m i d - v a l u e o f a & (q) 110 c l a s s i s 10 a n d w i d t h o f e a c h c l a s s i s 6. T h e u p p e r l i m i t o f t h e c l a s s i s (C) T h e m e a n o f e i g h t n u m b e r s i s 40. I f o n e & (r) 22.5 - 27.5 n u m b e r i s e x c l u d e d, t h e i r m e a n b e c o m e s 30. T h e e x c l u d e d n u m b e r i s (D) T h e c l a s s m a r k s o f a f r e q u e n c y d i s t r i b u t i o n a r e & (s) 147.5 15, 20, 25, 30, \dots \dots T h e c l a s s c o r r e s p o n d i n g t o t h e c l a s s m a r k 25 i s \end{matrix}

Choose the correct option:

A-p; B-s; C-q; D-r
A-r; B-p; C-q; D-s
A-s; B-p; C-r; D-q
A-s; B-p; C-q; D-r

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Q. The frequency polygon below shows marks obtained by students of a class.

From the graph, it can be said that the maximum number of students have scored marks between ____.

55-65
50-60
60-70
60

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Q.

From the given histogram , construct the frequency table

FREQUENCY 20 30 4 0 CLASS INTERVAL——

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Q.

State true or false.
To draw a frequency polygon, we have to first draw a histogram.

True
False

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Q.

A frequency polygon is constructed by plotting the coordinates of ___ and their respective frequency.

class interval of a class
mid-point of a class
upper limit of a class
lower limit of a class

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Q.

The mode of a frequency distribution can be determined graphically from:

Histrogram
Frequency polygon
Ogive
Frequency curve

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Q.

An ogive curve is

cumulative frequency vs upper limit curve only
cumulative frequency vs lower limit curve only
frequency vs upper limit curve
cumulative frequency vs upper limit or cumulative frequency vs lower limit .

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