Question

Find the mean

Marks:70,58,60,52,65,75,6

no.of students:3,5,4,7,6,2,3​

Answer 1

Answer:

Total marks

70x3 + 58x5 + 60x4 + 52x7 + 65x6 + 75x2 + 6x3

=210+290+240+364+390+150+18

=1662

Now, mean$\downarrow$

$= \frac{Total~marks}{Total~students} \\\\\sf =\frac{1662}{30} \\\\\sf 55.4$

55.4 is the mean marks