Business Statistics And Research Methods - Study Mode

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[#951] State the arithmetic mean of the following distribution: X (Series) : 145 155 165 175 F (Frequency) : 10 12 15 10

(A) 159.7

(B) 160.3

(C) 162.1

(D) 165.9

Correct Answer

(B) 160.3

[#952] When a data series is arranged in ascending or descending order, the value which comes in the middle of the series is called?

(A) Median

(B) Mode

(C) Mean

(D) Geometric mean

Correct Answer

(A) Median

[#953] Range of the coefficient of correlation is:

(A) ±0.25

(B) ±0.5

(C) ±1.0

(D) ±0.2

Correct Answer

(C) ±1.0

[#954] Sample results in order to provide reliable and accurate results must conform to which of the following requirements?

(A) Representativeness

(B) Adequacy

(C) Homogeneity

(D) All of these

Correct Answer

(D) All of these

[#955] The mean age group of 100 persons was found to be 30.2. Later, it was discovered that age 57 was misread as 27. Find the corrected mean.

(A) 30.5

(B) 31.23

(C) 32.32

(D) 36.44

Correct Answer

(A) 30.5