11th Class Statistics MCQS
If x and y are independent random variables, E(xy)
E(X) . E(Y)
E(XY)
xE(y)
E(XY)
The probability distribution of discrete random variable is called is
Probability distribution
Probability mass function
Both (a) and (b)
Frequency distribution
If x is a random variable with E(x) = 5 then E (3x – 2) =
15
13
1
0
Var (3x + 2)
3 Var(X) + 2
9 var (x)
3 Var X
9 var (x) + 2
Variance ) – ——————–
E2 (y)
E(y)2
E(y)
[E(y)]2
Var (KY) = ………………….
K2 Var(Y)
KY
K2Var (Y)
None of these
If y =-7x then E(y) = ……………
Zero
-7X
E(x)
-7E(X)
Random variable is also called ___________.
Random
None of these
Coverges
Chance stochasitc
The properties of discrete probability distribution are:
?P (x)= 1 and ?x. P
All of these above
?P(x) = 1 and 0 < P(x) ? 1
?p (x) = 1 and ?x. (x) = 1
If mean = 25 and variance is also 25, then coefficient of variation is
25%
10%
20%
100%
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