alleryStart learning →Five numbers have mean 20. If one number 30 is replaced by 10, the new mean is:
- 16
- 18
- 14
- 12
Show answer and solution
Correct answer: A. 16
The total drops from 100 by 20 to 80, and 80/5 = 16.
CA Foundation Measures of Central Tendency and Dispersion — practice questions — page 3
Explore 69 free Measures of Central Tendency and Dispersion questions in CA Foundation Quantitative Aptitude. Open each question or exercise to read its content, reference answers and available explanation.
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Showing questions 61–69 of 69.
Five numbers have mean 20. If one number 30 is replaced by 10, the new mean is:Read the answer and worked solution →Heights of plants are in centimetres. The range of these heights is expressed in:Read the answer and worked solution →Which measure of dispersion uses only the largest and smallest values?Read the answer and worked solution →For the progression 7, 11, 15, 19, 23 the mean and median are both:Read the answer and worked solution →The coefficient of variation of an exponential distribution equals:Read the answer and worked solution →When the mean is close to zero, the coefficient of variation tends to:Read the answer and worked solution →In actuarial science, the coefficient of variation is known as:Read the answer and worked solution →Every observation is doubled and then 5 is added. A mode of 6 becomes:Read the answer and worked solution →A data set has median 10. Every value is tripled and then 4 is subtracted. The new median is:Read the answer and worked solution →
Worked practice questions
Heights of plants are in centimetres. The range of these heights is expressed in:
- Percent
- Centimetres
- No unit
- Square cm
Show answer and solution
Correct answer: B. Centimetres
A difference of two heights keeps the unit of the data, which is cm.
Which measure of dispersion uses only the largest and smallest values?
- Variance of data
- Mean deviation
- The range value
- Standard deviation
Show answer and solution
Correct answer: C. The range value
The range is just the largest value minus the smallest value.
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