Q2 of 96 Page 161

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


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

No, it is not necessary that assumed mean consider as the mid - point of the class interval. It is considered as any value which is easy to simplify it.


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26

A school has five houses A,B,C,D and E. A class has 23 students, 4 from house A, 8 from house B, 5 from house C, 2 from house D and rest from house E. A single student is selected at random to be the class monitor. The probability that the selected student is not from A, B and C is

 1

The median of an ungrouped data and the median calculated when the same data is grouped are always the same. Do you think that this is a correct statement? Give reason.

 3

Is it true to say that the mean, mode and median of grouped data will always be different? Justify your answer.

 4

Will the median class and modal class of grouped data always be different? Justify your answer.