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