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?

Answer:

I

II

III

The mean of the new number is

Question 6:

In a frequency distribution mode is , mean is find median

Answer:

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.

Answer:

After the modal class

Question 8:

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

Answer:

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.

Answer:

Total number of means

Mean of is

Mean of number is

Mean of numbers