Q. What is the weighted mean of the scores 80, 90, and 70 with weights 1, 2, and 1 respectively?
Solution
Weighted mean = (80*1 + 90*2 + 70*1) / (1 + 2 + 1) = 85.
Correct Answer: B — 85
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Q. Which measure of dispersion is affected by extreme values?
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A.
Range
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B.
Variance
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C.
Standard Deviation
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D.
All of the above
Solution
All of these measures are affected by extreme values in the data set.
Correct Answer: D — All of the above
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Q. Which measure of dispersion is not affected by extreme values?
-
A.
Range
-
B.
Variance
-
C.
Standard Deviation
-
D.
Interquartile Range
Solution
Interquartile Range is not affected by extreme values.
Correct Answer: D — Interquartile Range
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Q. Which of the following measures is NOT a measure of dispersion?
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A.
Range
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B.
Variance
-
C.
Mean
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D.
Standard Deviation
Solution
Mean is a measure of central tendency, not dispersion.
Correct Answer: C — Mean
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Q. Which of the following measures of dispersion is affected by extreme values?
-
A.
Range
-
B.
Interquartile Range
-
C.
Variance
-
D.
Standard Deviation
Solution
Range is affected by extreme values as it is calculated as the difference between the maximum and minimum values.
Correct Answer: A — Range
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