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Probability means number of [successes (study French)]/[Total number (of boys or of girls)].

3/7 of 644 boys study French=3×644/7=3×92=276. 

5/8 of 520 girls study French=5×520/8=5×65=325.

Total number of students who study French=276+325=601.

Total number of students=644+520=1164.

644-276=368 boys and 520-325=195 girls don’t study French.

Total of non-French=368+195=563.

Probability that random student doesn’t study French is 563/1164.

by Top Rated User (711k points)

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