Given:
Ratio of three numbers = 3:5:7
Sum of the numbers = 975
Solution:
Let the number be 3x,5x and 7x
3x+5x+7x = 975
15x =975
x= 65
Numbers are:
3x=3× 65 = 195
5x = 5× 65 = 325
7x = 7× 65 = 455
The correct option is (a)
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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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A.
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D.
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