The mean of discrete observations $y_1, y_2, \ldots, y_n$ is given by:
- A$\frac{\sum_{i=1}^n y_i}{n}$
- B$\frac{\sum_{i=1}^n y_i}{\sum_{i=1}^n i}$
- C$\frac{\sum_{i=1}^n y_i f_i}{n}$
- D$\frac{\sum_{i=1}^n y_i f_i}{\sum_{i=1}^n f_i}$
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Similar Questions
Find the median of the sequence $^{2n}C_0, ^{2n}C_1, ^{2n}C_2, \dots, ^{2n}C_n$ (where $n$ is even).
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View SolutionIf the arithmetic mean of the numbers $x_1, x_2, x_3, ..., x_n$ is $\bar{x}$,then the arithmetic mean of the numbers $ax_1 + b, ax_2 + b, ax_3 + b, ..., ax_n + b$,where $a$ and $b$ are two constants,would be:
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View SolutionThe average age of a teacher and three students is $20$ years. If all the students are of the same age and the difference between the teacher's age and the age of one of the students is $20$ years,find the teacher's age in years.
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View SolutionCompute the median from the following table:
Marks obtained No. of students $0-10$ $2$ $10-20$ $18$ $20-30$ $30$ $30-40$ $45$ $40-50$ $35$ $50-60$ $20$ $60-70$ $6$ $70-80$ $3$
| Marks obtained | No. of students |
|---|---|
| $0-10$ | $2$ |
| $10-20$ | $18$ |
| $20-30$ | $30$ |
| $30-40$ | $45$ |
| $40-50$ | $35$ |
| $50-60$ | $20$ |
| $60-70$ | $6$ |
| $70-80$ | $3$ |
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View SolutionFind the median of the following frequency distribution.
Class $0 - 10$ $10 - 20$ $20 - 30$ $30 - 40$ $40 - 50$ $f_i$ $8$ $30$ $40$ $12$ $10$
| Class | $0 - 10$ | $10 - 20$ | $20 - 30$ | $30 - 40$ | $40 - 50$ |
| $f_i$ | $8$ | $30$ | $40$ | $12$ | $10$ |
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