Solution:
Consecutive even numbers from 1to 20 are:
2,4,6,8,10,12,14,16,18,20
Square of each numbers
Squares of the numbers are : 2²=4,4²=16,6²=36,8²=64,10²=100,12²=144,14²=196,16²=256,18²=324,20²=400
Sum of squares = 4+16+36+64+100+144+196+256+324+400=1540
Average = 1540/10 =154
Correct option is (a) 154
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12 Mins English English50 Questions100 Marks60 Mins English English10 Questions20 Marks12 Mins EnglishFor different sets of datasets X and Y. correlation coefficient between X and Y, that is R and standard deviation of X and Y, that is, S(X) and S(Y) are given in A-D below. Estimate the covariance between X and Y for each dataset and arrange in ascending order.
A. R= 0.5, S(X)= 8, S(Y)= 10
B. R= 4/7, S(X)= 7, S(Y)= 9
C. R= 0.7, S(X)= 12, S(Y)= 5
D. R= 19/42, S(X)= 14, S(Y)= 6
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