Question
The ratio of age of βBβ after 5 years from now and
age of βCβ 4 years ago from now is 7:4, respectively. The present age of βCβ is 50% of the present age of βAβ. If present age of βAβ is 72 years then find the present age of βBβ.Solution
Present age of βCβ = 0.5 Γ 72 = 36 years 4 years ago from now, age of βCβ = 36 β 4 = 32 years 5 years hence from now, age of βBβ = 32 Γ (7/4) = 56 years Present age of βBβ = 56 β 5 = 51 years
Two random variables x and y have the following regression equations -
3x + 2y β 26 = 0
6x + y β 31 = 0
then, the mean values o...
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