# 11th Class Statistics MCQS Chapter 7

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If a is a constant then E(a) is equal to
Square of a
a
Zero
2a

E(y-) is equal to
y-
E(y)
zero

For a constant K ,the variance of K.
K
None of these
Zero
A-2

The Area of trapezoid is equal to:
sum of paralled sides x base/2
sum of paralled sides x base
2 x base x sum of paralled side
Sum of paralled sides x base/4

Variance of ?2 is equal E to (Y2) – _______?
[E(y)]2
None of these
E (y)
E(y2)

For two independent random variables, Var(x) = 14 and Var(Y ) = 5, then var (X-y) is equal to.
70
9
None of these
19

Var (3x+2)
3Var (X)
9Var(x) +2
3Var(x) + 2
Var (x) + 0

The sum of probabilities of events of a sample space is always.
Continuous
Discrete
Equal
Always greater then oen

F (+?) is always equal to:
None of these
One
0
Two

Hourly temperature recorded by weather brave is the example of:
Qualitative
Continuous variable
Discrete variable
Both A and B

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