The mean of $15$ observations is $25$. Later on,it was found that one observation was taken by mistake as $20$ instead of $50$. Then,the correct mean is:
- A$20$
- B$27$
- C$28$
- D$30$
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.......... is not a measure of central tendency.
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View SolutionThe mean of the following frequency distribution is $46$. Find the missing frequency $f$.
Class $0-20, 20-40, 40-60, 60-80, 80-100, 100-120$ Frequency $10, f, 7, 6, 5, 4$
| Class | $0-20, 20-40, 40-60, 60-80, 80-100, 100-120$ |
| Frequency | $10, f, 7, 6, 5, 4$ |
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View SolutionCalculate the mean of the frequency distribution of the marks scored by $100$ students in a mathematics test:
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| Marks | $0-10$ | $10-20$ | $20-30$ | $30-40$ | $40-50$ |
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View SolutionFor the following data,the modal class is .... .
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