Question
The average age of a class of 25 girls is 16 years. If 5
new girls having average age of 10 years join the class, then the average age of the class becomes:Solution
Total age of 25 girls = 25 × 15 = 400 years Total age of 30 girls = 400 + (5 × 10) = 400 + 50 = 450 years Therefore new average age = 450/30 = 15 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.
Relevant for Exams:
