Question # 1

Normal distribution is

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unimodal

bimodal

trimodal

multimodal

All odd order moments about mean are

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unique

zero

different

one

In case of normal distribution the area to the left of the mean and area to the right of the mean is

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positive

negative

equal

unequal

The point of inflection in normal distribution are _______.

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μ - σ, μ + σ

μ - σ, μ + 2σ

μ, σ

None of these

The moment coefficient of skewness is

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β₁

β₂

S_k

m₃

Total probability under the normal curve is

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1

0

-1

∞

The Quartile deviation (Q.D) of a normal distribution is_______.

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4/5 σ

5/4 σ

2/3 σ

None of these

The total area under the normal curve is________.

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Zero

Equal

Unity

True

The probability density function has ------------------ value for every value of x.

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negative

positive

minimum

maximum

In a normal distribution,_____= μ + 0.64745 σ

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Q₁

Q₃

μ

σ

P(μ-2σ < X=< μ + 2σ)=

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0.6827

0.9545

0.9973

0.9827

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β₁

β₂

β₃

S_k

For normal distribution mean always lies between.

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Median and mode

Median and Q₁

Median and Q₃

None of these

Second moment about mean is also called

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mean

variance

skewness

standard deviation

If X - N (50,25), then=σ = ________.

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3

5

25

50

The normal distribution is a _______.

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Positive

Negative

Discrete

Continuous

μ - 2σ to=μ + 2σ contains approximately_______ area.

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75%

50%

95.45%

99.73%

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