The table above shows the number of pupils in each age group in a class. What is the probability that a pupil chosen at random is at least 1 years old?

The table above shows the number of pupils in each age group in a class. What is the probability that a pupil chosen at random is at least 1 years old?

Answer Details

P(At east 11 yrs) = P(11yrs) + P(12yrs)
= 27/40 + 7/40
= 34/40
= 17/20