Two groups of male students cast their votes on a particu...
Two groups of male students cast their votes on a particular proposal. The result are as follows:
| In favor | Against | |
| Group A | 128 | 32 |
| Group B | 96 | 48 |
If a student in favor of the proposal is selected for a post, what is the probability that he is from group A?
8/19
16/35
10/19
4/7
4/5
Correct answer is A
Probability that a student in favor is group A
= 128128+32+96+48
= 128304
= 819