Suppose 70 of kids who visit a doctor have a fever and 20 of

Suppose 70% of kids who visit a doctor have a fever, and 20% of kids with a fever have sore throats. What\'s the probability that a kid who goes to the doctor has a fever and a sore throat?

Solution

The total number of kids is 100.

70% have fever
20% of the kids who have fever have a sore throat

70/100 * 20/100 = 14%

Therefore , 14% who visit the doctor have sore throat and fever, which means that :

The probability that a kid goes to the doctor and has a sore throat & a fever is :

P = 14/100 = 0.14