Q19 of 37 Page 295

Given and . Find .

SD =


Or SD2 =


To find


=


SD2 = =


Expanding the numerator in the form of (a - b)2 = a2 + b2 - 2ab,


SD2 = =


Substituting all the known terms in the above equation,


SD2 = = 7.77


We know that, SD2 =


7.77 =


= 1159


SD2 = = 7.77


= 70


More from this chapter

All 37 →
17

If the coefficient of variation of a collection of data is 57 and its S.D is 6.84, then find the mean.

 18

A group of 100 candidates have their average height 163.8 cm with coefficient of variation 3.2. What is the standard deviation of their heights?

 20

The marks scored by two students A, B in a class are given below.


Who is more consistent?

 1

The range of the first 10 prime numbers 2, 3, 5, 7, 11, 13, 17, 19, 23, 29 is