If the two lines of regression of a bivariate distribution coincide, then the correlation coefficient ρ satisfies?
ρ = 0
ρ > 0
ρ < 0
ρ = 1 or -1
G.M of 4, 5, 20, 25 is
8
9
10
11
The temperature during a month in summer are recorded as ( in F ) 99, 78, 80, 94, 92, 76, 86, 96 . The mediantemperature is
76
99
92
89
Co - variance ( x, y ) between a x and y if Σx = 15, Σ y = 40, Σ xy = 110, n = 5 is _______.
22
-2
2
-22
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 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 = ________.
In a moderately skewed distribution the value of mean and median are 5 and 6 respectively. Then the value of mode is _______.
16
21
The temperature during a month in summer are record as ( in F ) 99, 78, 80, 94, 92, 76, 86, 96 The median temperature is _______.
The mean of the squares of first n natural numbers is
n2/2
1/8 n ( n + 1 )
1/6 n ( 2n +1 )
1/6 ( n + 1 ) ( 2n + 1 )
The central value of the set of observations is called
Mean
Median
Mode
G.M
