# CBSE Class 10-Mathematics: Chapter –14 Statistics Part 2

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Question 5:

The mean of ‘n’ observation is , if the first term is increased by 1, second by and so on. What be the new mean?

I

II

III

The mean of the new number is

Question 6:

In a frequency distribution mode is , mean is find median

Question 7:

The mode of a distribution is & the modal class is and the frequency preceding the modal class is and the frequency after the modal class is . Find the frequency of the modal class.

After the modal class

Question 8:

The mean of numbers is , what will be the new mean, if each observation is increased by 2?

Let be number with then mean equal to 19 then

New number are

Let be the mean of new numbers

Then

Mean of new numbers

Question 9:

Find the mean of numbers given mean of ten of them is and the mean of remaining is 9.