Q2 of 35 Page 371

Find the mean and variance for each of the data in Exercise.

First n natural numbers

We know that Mean =


∴ Mean,


We know that Variance, σ2 = =



We know that (a-b)2 = a2 – 2ab + b2








We know that (a + b) (a – b) = a2 – b2



Ans. Mean = and Variance =


More from this chapter

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12

Calculate the mean deviation about median age for the age distribution of 100 persons given below:


[Hint Convert the given data into continuous frequency distribution by subtracting 0.5 from the lower limit and adding 0.5 to the upper limit of each class interval]

 1

Find the mean and variance for each of the data in Exercise.

6, 7, 10, 12, 13, 4, 8, 12

 3

Find the mean and variance for each of the data in Exercise.

First 10 multiples of 3

 4

Find the mean and variance for each of the data in Exercise.