We have a number .
To write it as a fraction first count the number of decimals and call it (which, in our case, has a value of 3). Multiply the number with
to get
. Then divide this number by
to get
from here you can either simplify (if the assignment says so, then the simplified fraction is
) or not.
Hope this helps.
Let be the 20 marks of the boys, and
be the 10 marks of the girls.
We know that the global mean was 70, meaning that
Multiplying both sides by 30 we deduce that the sum of the scores of the whole classroom is
By the same logic, we work with the marks of the boys alone: we know the average:
And we deduce the sum of the marks for the boys:
Which implies that the sum of the marks of the girls is
And finally, the mean for the girls alone is
