Let $M$ denote the median of the following frequency distribution. Then $20M$ is equal to:
Class $0-4$ $4-8$ $8-12$ $12-16$ $16-20$
Frequency $3$ $9$ $10$ $8$ $6$

  • A
    $416$
  • B
    $104$
  • C
    $52$
  • D
    $208$

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If ${d_i}$ is the deviation of a class mark ${y_i}$ from $a$,the assumed mean,and ${f_i}$ is the frequency,if ${M_g} = x + \frac{1}{{\sum {f_i}}}(\sum {f_i}{d_i})$,then $x$ is:

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