The mean of the following frequency distribution is $43.75$. Find the missing frequency $f$.
Class$0-10$$10-20$$20-30$$30-40$$40-50$$50-60$$60-70$$70-80$$80-90$$90-100$
Frequency$8$$4$$20$$45$$64$$32$$f$$8$$2$$2$

  • A
    $10$
  • B
    $15$
  • C
    $20$
  • D
    $25$

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Similar Questions

In a frequency distribution,the modal class is $70-85$ with frequency $25$. The frequencies of the classes succeeding and preceding the modal class are $20$ and $8$ respectively. Then,the values of $f_{0}, f_{1}$ and $f_{2}$ are respectively.

Find the median of the following frequency distribution:
Class $0-5$ $5-10$ $10-15$ $15-20$ $20-25$ $25-30$ $30-35$
Frequency $5$ $15$ $15$ $8$ $4$ $2$ $1$

In the formula $\bar{x} = A + \frac{\Sigma f_{i} d_{i}}{\Sigma f_{i}}$,$d_{i} =$ .........

Daily wages of $110$ workers,obtained in a survey,are tabulated below:
Daily wages (in $Rs.$) Number of workers
$100-120$ $10$
$120-140$ $15$
$140-160$ $20$
$160-180$ $22$
$180-200$ $18$
$200-220$ $12$
$220-240$ $13$

Compute the mean daily wages of these workers (in $Rs.$).

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Find the mean of the following data by all the three methods:
Class $50-70$ $70-90$ $90-110$ $110-130$ $130-150$ $150-170$
Frequency $10$ $18$ $7$ $6$ $5$ $4$

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