Calculate the mean of the following frequency distribution:
Class $10-20$ $20-30$ $30-40$ $40-50$ $50-60$
Frequency $12$ $16$ $8$ $6$ $8$

  • A
    $31.4$
  • B
    $35.5$
  • C
    $37.4$
  • D
    $38.8$

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Similar Questions

Find the mean,median and mode of the following frequency distribution:
Class $5-10$ $10-15$ $15-20$ $20-25$ $25-30$ $30-35$
Frequency $11$ $20$ $35$ $20$ $8$ $6$

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The modal class of the following frequency distribution is ........
Class$4-8$$8-12$$12-16$$16-20$$20-24$$24-28$
Frequency$9$$8$$12$$7$$15$$1$

Find the mean,median and mode of the following frequency distribution:
Class $0-30$ $30-60$ $60-90$ $90-120$ $120-150$ $150-180$
Frequency $8$ $15$ $16$ $20$ $12$ $9$

The percentage of marks obtained by $100$ students in an examination are given below:
Marks $30-35$ $35-40$ $40-45$ $45-50$ $50-55$ $55-60$ $60-65$
Frequency $14$ $16$ $18$ $23$ $18$ $8$ $3$

Determine the median percentage of marks.

Find the mean of the following frequency distribution:
Class $21-25$ $26-30$ $31-35$ $36-40$ $41-45$ $46-50$ $51-55$
Frequency $18$ $32$ $30$ $40$ $25$ $15$ $40$
(in $.675$)

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