Consider the following distribution:
Marks obtainedNumber of students
More than or equal to $0$$63$
More than or equal to $10$$58$
More than or equal to $20$$55$
More than or equal to $30$$51$
More than or equal to $40$$48$
More than or equal to $50$$42$

The frequency of the class $30-40$ is:

  • A
    $3$
  • B
    $4$
  • C
    $5$
  • D
    $6$

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Similar Questions

For a given frequency distribution,the frequencies of the first,second,and third class are $8$,$15$,and $18$ respectively. Then,the cumulative frequency of the third class is $\ldots \ldots \ldots \ldots .$

For some given data,if $Z - M = 12$,then $M - \bar{x} = \ldots \ldots \ldots$

In the formula $\bar{x} = A + \frac{\Sigma f_{i} u_{i}}{\Sigma f_{i}} \times c$ for the mean,$u_{i} = \ldots \ldots \ldots$

Rachana had an average score of $45$ from $6$ tests. Her teacher dropped her lowest score,which is $30$,and calculated the average of the remaining scores to decide her grade. Which of the following gives her new average score?

Find the mean of the following data:
Class $200-299$ $300-399$ $400-499$ $500-599$ $600-699$ $700-799$ $800-899$
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