alleryA data set has mean 10. Each value x is changed to 2x + 3. The new mean is
- 13
- 20
- 23
- 26
Show answer and solution
Correct answer: C. 23
A linear change carries over to the mean, so 2 x 10 + 3 = 23.
SSC CGL Arithmetic Mean — practice questions — page 2
Explore 51 free Arithmetic Mean questions in SSC CGL Quantitative Aptitude. Open each question or exercise to read its content, reference answers and available explanation.
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A data set has mean 10. Each value x is changed to 2x + 3. The new mean isRead the answer and worked solution →Mean 50 and standard deviation 10 give a coefficient of variation ofRead the answer and worked solution →Which measure of central tendency is most affected by extreme values?Read the answer and worked solution →For income data with a few very rich people, which average is the fairest?Read the answer and worked solution →Which average can be found for non-numeric categories such as surnames?Read the answer and worked solution →In a normal distribution, the relation among mean, median and mode is that theyRead the answer and worked solution →In a normal distribution, what share of values lies within one standard deviation of the mean?Read the answer and worked solution →Within three standard deviations of the mean, a normal distribution holds aboutRead the answer and worked solution →Standard deviation is defined as the square root of theRead the answer and worked solution →A small standard deviation means the values areRead the answer and worked solution →The unbiased sample variance divides the squared deviations byRead the answer and worked solution →The median is the same as which percentile?Read the answer and worked solution →The median is also called theRead the answer and worked solution →For an even number of ordered observations, the median isRead the answer and worked solution →The mean of any sample always liesRead the answer and worked solution →For data in an arithmetic progression, the relation between mean and median is thatRead the answer and worked solution →In a moderately skewed unimodal distribution, the median usually liesRead the answer and worked solution →The mode of a data set is the value thatRead the answer and worked solution →Per capita income of a nation is an example of which statistic?Read the answer and worked solution →A weighted mean differs from a simple mean because some valuesRead the answer and worked solution →Which average is described as the middle value after sorting?Read the answer and worked solution →
Worked practice questions
Mean 50 and standard deviation 10 give a coefficient of variation of
- 5%
- 10%
- 20%
- 40%
Show answer and solution
Correct answer: C. 20%
Coefficient of variation is SD / mean x 100, which is 10 / 50 x 100 = 20%.
Which measure of central tendency is most affected by extreme values?
- Mean
- Median
- Mode
- Quartile
Show answer and solution
Correct answer: A. Mean
The mean uses every value in its sum, so one very large or small value pulls it strongly.
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