Question
How many seconds will a train 64 m in length, travelling
at the rate of 42 km an hour, take to pass another train 82 m long, proceeding in the same direction at the rate of 30 km an hour?Solution
Relative speed = 42 – 30 = 12 km/hr Speed (m/sec) = 12 × (5/18) = 10/3 m/sec Time = Total length of both the trains/Relative speed => Time = (82 + 64)/(10/3) = 43.8 sec
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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