Question
The present age of P is 40% more than that of Q, and the
ratio of Q’s age to R’s age is 3:5. Find Q’s age 6 years ago if the oldest among them is 90 years old.Solution
ATQ, The ratio of age of P to Q = 140:100 = 7:5 Let the present age of P = 7x And the present age of Q = 5x And the present age of R = 5x × 5/3 = (25/3)x Since R is the eldest, (25/3)x = 90 x = 90 × 3/25 x = 270/25 x = 10.8 Age of Q = 5x = 5 × 10.8 = 54 Therefore, Q’s age 6 years ago = 54 – 6 = 48 years
At a round table, n persons are seated on n chairs. The probability that two friends from same college are sitting next to each other, is:
The deseasonalised time - series data will have only trend (T), cyclical (C) and irregular (I) components and is expressed as:
The grouped data for the observation are as follows.
Class :Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 2-4Â Â Â Â Â Â Â Â 4-6Â Â Â Â Â Â Â Â Â 6-8<...
These seventh decile (D7) of data set 4, 3, 10, 9, 1 is
The coefficient of correlation is the _________ of coefficients of regression.
Five persons A, B, C, D and E occupy seats in a row at random. The probability that A and B sit next to each other is:
Which option is WRONG?
Which option is incorrect for the component of ti.me series.
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