Let the present age of the son be x.
According to question
The present age of the man = 2x.
2x - 18 = 3(x - 18)
2x - 18 = 3x - 54
x = 36
the present age of the son = 36.
The present age of the man = 2x, or 2 × 36 = 72.
The sum of their present ages = 36 + 72 = 108.
English
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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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C.
D.
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