
Q12 Calculate the mean deviation about median age for the age distribution of 100 persons given below: Age 1620 2125 2630 3135 3640 4145 4650 5155 Number 5 6 12 14 26 12 16 9 Ans: Our Experts will give the answer soon.
This branch of Mathematics deals with a large number of data. When data is large it is very difficult to handle and we can not reach the exact result if we do it manually. Some methods are necessary for this and these methods will be provided in this chapter. Some topics are studied in earlier classes such as 8,9,10. Now, we extend our periphery. This chapter consists of measures of dispersion; mean deviation, variance and standard deviation of ungrouped/grouped data, analysis of frequency distributions with equal means but different variances.
Download pdf of NCERT Solutions for Class Mathematics Chapter 15 Stastistics
Download pdf of NCERT Examplar with Solutions for Class Mathematics Chapter 15 Stastistics
Q12  Calculate the mean deviation about median age for the age distribution of 100 persons given below: Age 1620 2125 2630 3135 3640 4145 4650 5155 Number 5 6 12 14 26 12 16 9 
Ans:  Our Experts will give the answer soon. 
Find the sum of integers from 1 to 100 that are divisible by 2 or 5.
If the sum of three numbers in A.P., is 24 and their product is 440, find the numbers.
A wheel makes 360 revolutions in one minute. Through how many radians does it turn in one second?
The sum of the first four terms of an A.P. is 56. The sum of the last four terms is 112. If its first term is 11, then find the number of terms.
How many terms of G.P. 3, 3^{2}, 3^{3}, … are needed to give the sum 120?
Find the sum of all numbers between 200 and 400 which are divisible by 7.
Insert five numbers between 8 and 26 such that the resulting sequence is an A.P.
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Name the octants in which the following points lie:
(1, 2, 3), (4, –2, 3), (4, –2, –5), (4, 2, –5), (–4, 2, –5), (–4, 2, 5), (–3, –1, 6), (2, –4, –7)
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If the sum of three numbers in A.P., is 24 and their product is 440, find the numbers.
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How many terms of G.P. 3, 3^{2}, 3^{3}, … are needed to give the sum 120?
What will Rs 500 amounts to in 10 years after its deposit in a bank which pays annual interest rate of 10% compounded annually?
Find the sum of all two digit numbers which when divided by 4, yields 1 as remainder.