The temperature during a month in summer are recorded as ( in F ) 99, 78, 80, 94, 92, 76, 86, 96 The median
temperature is
76
99
92
89
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
The AM of the series 1, 2, 4, 8 ..... 2n is
The variance of the variates 112, 116, 120 125, 132 about their A.M is
58.8
60
48.8
61.8
The central value of the set of observations is called
Mean
Median
Mode
G.M
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 )
If x and y are two variables such that
1/2
- 1/2
1/4
- 1/4
G.M of 4, 5, 20, 25 is
8
9
10
11
Geometric means of 2, 22, 23, . . . . . 2n is
22/n
2n/2