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Finding Mean for Grouped Data When Class Intervals Are Given

While computi...

Question

While computing the mean of the grouped data, we assume that the frequencies are
(a) evenly distributed over the classes
(b) centred at the class marks of the classes
(c) centred at the lower limits of the classes
(d) centred at the upper limits of the classes

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Solution

While computing the mean of the group data, we assume that the frequencies are (b) centred at the class marks of the classes.

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Q. 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) upper limits of the classes
(b) lower limits of the classes
(c) class marks of the classes
(d) upper limits of preceding classes

Q. Question 1
In the formula

¯ x = a + \frac{\sum f_{i} d_{i}}{\sum f_{i}}

, for finding the mean of grouped data

d_{i}^{'} s

are deviation from a of
(a) lower limits of the classes
(b) upper limits of the classes
(c) mid-points of the classes
(d) frequencies of the class marks

Q. In the formula

\bar{X} = a + \frac{Σ f_{i} d_{i}}{Σ f_{i}}

, for finding the mean of grouped data

{d_{i}}^{'^{s}}

are derivations from

a

of
(a) lower limits of classes (b) upper limits ofclasses
(c) mid-points of classes (d) frequency of the class marks

Q. Question 22
For drawing a frequency polygon of a continuous frequency distribution, we plot the points whose ordinates are the frequencies of the respective classes and abcissae are, respectively:

A) Upper limits of the classes
B) Lower limits of the classes
C) Class marks of the classes
D) Upper limits of preceding classes

Class marks of a distribution are 26, 31, 36, 41, 46, 51, 61, 66, 71. The lower and upper class limits of the first class interval are

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Finding Mean for Grouped Data When Class Intervals Are Given

Standard X Mathematics

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