Question # 1

Which of the following statements is true.

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As a rule statisticians genereally use between 6 and 15 classes.

As a rule, statisticians regards a frequency distribution incomplete if it has fewer than 20 classes.

Classes describe only one characteristics the data ebign organized

None of these

The number 4.50001 rounded off to nearest unit is.

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4

5

4.5

4.01

The types of dispersion are.

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2

3

4

5

The mean of the absolute deviations of observations from mean, median or mode is called

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Quartile deviation

Absolute deviation

Mean

Mean deviation

Measurement usually provide.

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Discrete data

Continuous data

Primary data

Qualitative data

In the plural sense, statistion mean.

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Methods

Numerical data

Sample values

Population values

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

In a symmetrical distribution Q₁ = 20, Median = 30 the Q₃ is:

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50

40

30

60

Range of the ungroup data can be calculate by formula.

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X_m - X_m

X_m - X₀

X₀

X₀ - X_m

The difference between the upper and the lower boundaries of a class are known as:

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class marks

class intensive

class frequency

class limit

A binomial random variable can assume the values

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1,2......n

0,1,2......00

0,1,2......n

2,4,6,8,10

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

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None of these

A fair coin is tossed five the times. The probability of getting zero head is.

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1/2

1/32

6

1/5

A student soved 25 questions from first 50 questios of a book to be solved. The prob, that he will solve the remaining all questions.

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0.25

0.51

1

0

If a is a constant then E(a) is equal to

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a

Square of a

Zero

2a

In symmetrical distribution if Q1 = 4, Q3 = 12 then median is.

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4

6

8

zero

The percentage of observations lying within the items X + 3S in the normal distribution.

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68.26%

95.44%

70.00%

99.75%

If n is the number of elements of a set. the total numebr of subsects of this set in

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2n

n2

2ⁿ

n

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