statistic problem

Question

Giving a test to a group of students, the grades and gender are summarized below

A	B	C	Total
Male	3	19	9	31
Female	13	14	12	39
Total	16	33	21	70

If one student is chosen at random,

Find the probability that the student was NOT a male that got a "C"

Give answer with three significant figures.

Answer 1

"If one student is chosen at random" this means out of all students, so the denominator should be 70.

The number of students who are not male and got a C is equivalent to the number of students who are female and got a C, which is 12 I'm assuming from the misaligned table header.

The numerator should be 12.

So the probability that a randomly selected student is not a male and got a C is 12/70=6/35=0.171