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Find the mean and median for the following data :
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Correct table (Classes, frequency ($f_i$), $x_i$, $f_i x_i$, $cf$) ($2$ marks)
Mean $= \frac{970}{25} = 38.8$ ($1$ mark)
Median class is $35 - 45$ ($1/2$ mark)
Median $= 35 + \left(\frac{\frac{25}{2} - 10}{7}\right) \times 10$ ($1$ mark)
$= \frac{270}{7}$ or $38.57$ approx. ($1/2$ mark)
Mean $= \frac{970}{25} = 38.8$ ($1$ mark)
Median class is $35 - 45$ ($1/2$ mark)
Median $= 35 + \left(\frac{\frac{25}{2} - 10}{7}\right) \times 10$ ($1$ mark)
$= \frac{270}{7}$ or $38.57$ approx. ($1/2$ mark)