Question

The table shows the result of a restaurant survey.
Meals Service Good Service poor Total
Lunch 49 39 88
Dinner 19 15 34
Total 68 54 122
Find the probability the service was poor, given that the meal was dinner.

Answer 1

If the meal was dinner there were total of 34 that have been in the survey. Out of those 34, 15 of them said that service was poor.

That simply means that 15/34 is the probability that the service was poor if you are taking dinner.