Three numbers are in the ratio of 2 ∶ 5 ∶ 6.
Let the numbers are 2x, 5x and 6x.
Given
2x + 5x + 6x = 663
13x = 663
x = 663 / 13 = 51
So, the numbers are,
First number 2x = 2 × 51 = 102
Second number 5x = 5 × 51 = 255
Third number 6x = 6 × 51 = 306
So, the three numbers are 102, 255 and 306.
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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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