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?
A
8/19
B
16/35
C
10/19
D
4/7
E
4/5
Verified Correct Answer: A.
Step-by-Step Mathematical Solution
Probability that a student in favor is group A
= \(\frac{128}{128 + 32 + 96 + 48}\)
= \(\frac{128}{304}\)
= \(\frac{8}{19}\)
Source: Myschool Past Questions Archive (Record #22701)