Question

A class of 30 students occupy a classroom containing 5 rows of seats, with 8 seats in each row. If the students seat themselves at random, the probability that the sixth seat in the fifth row will be empty is

Answer 1

Total number of student = 30

Find the total number of seats:

Total number of seats = 5 x 8 = 40

Find the number of empty seats:

Empty seats = 40 - 30 = 10

Find the probability that any chosen seat is empty:

P(empty) = 10/30 = 1/3 (or 33.3%)

Answer:  The probability that the sixth seat in the fifth row will be empty is 1/3 or 33.3%