In the formula X =a+ _id_i _i for finding the mean of grouped data di’s are deviations from a of:

In the formula X =a+ _id_i _i for finding the mean of grouped dat…

MCQ

In the formula $\overline{\text{X}}=\text{a}+\frac{\sum\text{f}_\text{i}\text{d}_\text{i}}{\sum\text{f}_\text{i}}$ for finding the mean of grouped data di’s are deviations from $a$ of:

A
lower limits of classes.
B
upper limits of classes.
✓
mid$-$points of classes.
D
frequency of the class marks .

✓

Answer

Correct option: C.

mid$-$points of classes.

We know that, $d_i=x_i-a$
i .e , $d_i$ s are the deviation from a mid$-$points of the classes.

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Choose the correct answer from the given four options: Consider the following distribution:

Marks obtained	Number of students
More than or equal to 0	63
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