Question

In a second grade class containing 12 girls and 11 boys, 2 students are selected at random to give out the math papers. what is the probability that the second student chosen is a boy, given that the first one was a girl?

Answer 1

Answer:

6/23

Step-by-step explanation:

Probability is the number of possible outcome divided by the total number of outcomes. It is a ratio. Mathematically, the probability Pr of an event "a" happening given tat the total number of outcomes is T

Pr = a/T

Total number of students

= 11 + 12

= 23

The probability of picking a

Girl = 12/23

Boy = 11/23

The probability of picking a girl and  a boy (without replacement)

= 12/23 * 11/22

= 12/46

= 6/23

Answer 2

12/23 = probability first is a girl
11/22= probability second is a boy
probability of both 132/506
132/506 = 66/253