MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Finding Mean for Grouped Data When Class Intervals Are Given

Question 1In ...

Question

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

Open in App

Solution

We know that, $d_{i} = x_{i} - a$
i.e., $d_{i}^{'} s$ are the deviation from a of mid-points of the classes.

Suggest Corrections

thumbs-up

0

Similar questions

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. In the formula,

x = \{A + \frac{\sum f_{i} d_{i}}{\sum f_{i}}\}

for finding the mean of the grouped data, the d_i's are the deviations from A of
(a) lower limits of the classes
(b) upper limits of the classes
(c) midpoints of the classes
(d) none of these

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

Q. Question 2
While computing mean of grouped data, we assume that the frequencies are
(a) evenly distributed over all the classes
(b) centred at the class marks of the classes
(c) centred at the upper limits of the classes
(d) centred at the lower limits of the classes

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

View More

Join BYJU'S Learning Program

explore_more_icon

Explore more

Finding Mean for Grouped Data When Class Intervals Are Given

Standard X Mathematics

Join BYJU'S Learning Program

CrossIcon