Question

The members in a chinese orchestra includes : 3 primary two,6primary three, 6 primary four,10 primary five, and 5 primary six students. if a student is selected at random, what is the rpbability that he/she is . from primary five or primary six?

a. 2/5

b. 1/10

c. 1/2

d. 1/3

Answer 1

There are total 30 students out of which, 3 are primary two,6 are primary three, 6 are primary four,10 are primary five, and 5 are primary six students.

If a student is selected at random, the probability that he/she is from primary five is =10/30

If a student is selected at random, the probability that he/she is from primary six is =5/30

Therefore, the probability that he/she is from primary five or primary six =10/30+5/30

=15/30

=1/2

Therefore c) is the correct choice.