(A) To draw a frequency polygon for a continuous frequency distribution,we plot points on a graph. The $y$-coordinate (ordinate) of each point represe

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(A) To draw a frequency polygon for a continuous frequency distribution,we plot points on a graph. The $y$-coordinate (ordinate) of each point represents the frequency of the respective class,and the $x$-coordinate (abscissa) represents the class mark of that class. The class mark is calculated as $\frac{\text{Lower Limit} + \text{Upper Limit}}{2}$.

Class 9 Mathematics Statistics Mix Examples - Statistics and Probability

Easy

For drawing a frequency polygon of a continuous frequency distribution,we plot the points whose ordinates are the frequencies of the respective classes and abscissae are respectively:

A
class marks of the classes
B
lower limits of the classes
C
upper limits of the classes
D
upper limits of preceding classes

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Mix Examples - Statistics and Probability

If the mean of $20$ observations is $27.2$,then $\Sigma f_{i} x_{i}$ is ............

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The mean of $10$ observations is $52$. If $12$ is subtracted from each observation,then the mean of the new observations so obtained is:

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Is it correct to say that in a histogram,the area of each rectangle is proportional to the class size of the corresponding class interval? If not,correct the statement.

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$A$ class consists of $50$ students out of which $30$ are girls. The mean of marks scored by girls in a test is $73$ (out of $100$) and that of boys is $71$. Determine the mean score of the whole class.

Medium

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Draw a histogram for the following frequency distribution with unequal class length:

Class $0-5$ $5-10$ $10-20$ $20-30$ $30-50$ $50-70$ $70-100$

Frequency $6$ $8$ $14$ $16$ $24$ $20$ $30$

Medium

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Class	$0-5$	$5-10$	$10-20$	$20-30$	$30-50$	$50-70$	$70-100$
Frequency	$6$	$8$	$14$	$16$	$24$	$20$	$30$

For drawing a frequency polygon of a continuous frequency distribution,we plot the points whose ordinates are the frequencies of the respective classes and abscissae are respectively:

Similar Questions

If the mean of $20$ observations is $27.2$,then $\Sigma f_{i} x_{i}$ is ............

The mean of $10$ observations is $52$. If $12$ is subtracted from each observation,then the mean of the new observations so obtained is:

Is it correct to say that in a histogram,the area of each rectangle is proportional to the class size of the corresponding class interval? If not,correct the statement.

$A$ class consists of $50$ students out of which $30$ are girls. The mean of marks scored by girls in a test is $73$ (out of $100$) and that of boys is $71$. Determine the mean score of the whole class.

Draw a histogram for the following frequency distribution with unequal class length: Class $0-5$ $5-10$ $10-20$ $20-30$ $30-50$ $50-70$ $70-100$ Frequency $6$ $8$ $14$ $16$ $24$ $20$ $30$

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Draw a histogram for the following frequency distribution with unequal class length:

Class $0-5$ $5-10$ $10-20$ $20-30$ $30-50$ $50-70$ $70-100$

Frequency $6$ $8$ $14$ $16$ $24$ $20$ $30$