Math Chapter Wise question with answer

Q01 If f (x+y, x–y) = xy, then what will be the arithmetic mean of f(x,y) and f(y,x)? English · TGT 2013 Q02 If the sum of the deviations of 50 observations from 30 is 50, then the mean of these observations is: English · EMRS PGT-2023 Q03 If the mean deviations about the median of the numbers a, 2a, 3a,..., 50a is 50, then |a| equals: English · EMRS PGT-2023 Q04 The median and mode of a frequency distribution are 26 and 29 respectively. Then the mean is: English · EMRS TGT-2023 Q05 The algebraic sum of deviations of 25 observations from 18 is 75, then mean of observations is: English · KVS PGT 2023 Q06 If m is the mean of a Poisson distribution, then variance is: English · KVS PGT 2022