Question # 1

if X and Y are independent random varaibesl the S.D. (X-Y) is equal to

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Var (X) - var (Y)

Var (X) + Var (Y)

E(X-Y)2

E(X + Y)2

When a graph is made to show the total and part of the data, we draw.

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Simple bar chart

Multiple bar chart

Component barchart

None of these

For positive skewed distribution mean _________ Median __________ Mode.

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=

<

>

None of these

Karl Pearson's 1^st co-efficient of skewness is given by formula

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None of these

When two dice are rolled, the maximum totla on the two faces of dice will be.

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2

6

12

36

When calculating the average rate of debt growth for a company, the correct mean to use is.

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Arithmetic mean

Weigheted arthmetic

Geometric mean

None of these

The minimum classes may be determine by formula.

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C = 1+3, log (n)

c = √n

X_m - X₀

Both A and B

The hypergeometric distribution has parameters

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Two

Three

Four

Five

The data about the sex of new babies is called:

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Continuous data

Qualitative data

Quantitative data

Discrete data

If a curve has a longer tail to the left . it is called a.

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Symmetrical curve

Positive skewed curve

Negatively skewed curve

None of these

What is teh major assumption we make when computing a mean from grouped data.

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All values are discrete

Eveery value in a class is equal to the midpoint

No value occurs more than once

Each class contains exactly the same number of values

Random number can be generated manully by

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Dawing cards from numbered cards

Roitaing or spinning numbered wheels

Use of random numbers table

All of these

Y₃+y₄+......+y₁₅ =

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Σ¹⁵ _i=1 Y₁

Σ¹⁵ _i=3 Y₂

¹⁵Σ_i=3 Y_i

¹⁵Σ_i=3Y_i²

For symmetrical distribution mega 3 is.

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zero

1

2

3

If x is a continuous random vriable, then the function f (x) is.

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A probability function

A probability denaity function

A density function

Both b and c

When two coins are tossed simultaneously, P (one head ) is.

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1/2

1/4

3/4

1.0

For positively skewed binomial distribution

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P = 0

P < 0.5

P > 0.5

P = 0.5

The probability of drawing a king of spade from a pack of 52 cards is.

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1/4

1/13

1/26

1/52

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