Random variable

Both (b) & (c) but not (a)

Binomial random variable

Continuous random variable

May be independent or dependent

None of these

Dependent

independent

Mean deviation

Variance

Zero

S.D.

-7 X

Zero

7 S.D(X)

-7 S.D(X)

Mean of the random variable

Variance of the random variable

Both (a) & (b)

None of these

$\sqrt{Var(X)+Var(Y)}$

$\sqrt{Var(X)-Var(Y)}$

$S.D(X)+S.D(Y)$

$S.D(X)-S.D(Y)$

$\sum p(x)$

$\sum x^{2}p(x)$

$\sum xp(x)$

One

b2 Var (X)

b Var(X)

Var(bX) + a

None

k Var(Y)

Var(Y)

k2 Var(Y)

k2

k2

0

None of these

k

Both (b) & (c)

E(X) E (Y)

E(X) + E(Y)

XY

Historigram

Ogive

Probability histogram

Frequency polygon

1

Less than 1

Greater than 1

Zero

3

1/8

8

0

$\sum P(x)=1\mathrm{\&}0\le P(x)\le 1$

All of the above

$\sum P(x)=1\mathrm{\&}\sum xP(x)=1$

$\sum P(x)=1\mathrm{\&}P(x)=0$

2 x base x Sum of parallel sides

$\frac{Sumofparallelsidesxbase}{2}$

$\frac{Sumofparallelsidesxbase}{4}$

Sum of parallel sides x base

The sum of spots, when two dice are rolled

The number of defective bulbs

The amount of milk produced by a cow

The number of patients in a hospital

Continuous

None

Qualitative

Discrete

Mean

One

Zero

Infinity

Discrete variable

Continuous variable

Qualitative variable

both (b) & (c)