The relationship between mean, median and mode for a moderately skewed distribution is
Mode = Median - 2 Mean
Mode = 2 Median - Mean
Mode = 3 Median - 2 Mean
Mode = 2 Median - 3 Mean
If the regression coefficients are o.8 and 0.2, then the value of co - efficients of correlation is
0.16
0.4
0.04
None of these
For a given distribution of marks mean is 35. 16 and its standard deviation is 19. 76. The coefficient of variation is _____.
G.M of 4, 5, 20, 25 is
8
9
10
11
If x and y are two independent variables, then Cov ( x, y ) equals?
1
-1
0
In a moderately skewed distrbution, the values of mean and median are 5 and 6 respectively. The value of mode in such a situation is nearly equal to
16
The mean of first n natural numbers is
n ( n + 1 )
n + 1
The mean of the squares of first n natural numbers is
1/8 n ( n + 1 )
1/6 n ( 2n +1 )
1/6 ( n + 1 ) ( 2n + 1 )
The AM of three sizes 3, 4 and 2.5 weighted respectively by the numbers 15, 5 and x is found to be 3. Then x =
7
5
The range of following set of observations : 2, 3, 5, 9, 8, 7, 6, 5, 7, 4, 3, is
5.5
6
