For calculating mean of grouped data, the mid point of each class interval is chosen to represent all the observations from that class.

True

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False

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Solution

The correct option is A
True

For calculating mean of grouped data, the midpoint of each class interval is chosen to represent all the observations from that class. The midpoint is called the class mark.

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Similar questions

For calculating the mean of grouped data, the midpoint of each class interval is chosen to represent all the observations from that class.

Q. For finding the mean value of the grouped data it is assumed that the frequency of each class interval is not centred around its mid-point.

Q. Question 02.
In calculating the mean of grouped data, grouped in classes of equal width, we may use the formula,

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

where, a is the assumed mean, a must be one of the mid - point of classes. Is the last statement correct ? Justify your answer.

The marks obtained by the students of a class , in a exam which was out of 50 mark given below

$\begin{matrix} Marks & Number of students 5 & 1 7 & 2 11 & 2 16 & 3 21 & 5 24 & 6 28 & 3 32 & 5 34 & 8 39 & 6 43 & 4 45 & 2 49 & 3 \end{matrix}$

(i) Find the mean for the ungrouped data.

(ii) Represent the same data as grouped data, with class interval of width = 10

The mid - points of class intervals $x_{i}$ along with respective frequencies $f_{i}$ for recorded observations are given. Calculate the mean deviations about mean $x$

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For calculating mean of grouped data, the mid point of each class interval is chosen to represent all the observations from that class.

The correct option is A True For calculating mean of grouped data, the midpoint of each class interval is chosen to represent all the observations from that class. The midpoint is called the class mark.

The correct option is A
True

For calculating mean of grouped data, the midpoint of each class interval is chosen to represent all the observations from that class. The midpoint is called the class mark.