Thirty-six of the staff of 80 teachers at a local intermediate school are certified in Cardio-
Pulmonary Resuscitation (CPR).In 180 days of school, about how many days can we expect that
The teacher on bus duty will likely be certified in CPR?
A) 5 days
B) 45 days
C) 65 days
D) 81 days

Question

Quizplus · Accepted Answer

The probability of a teacher being certified in CPR is 36/80. Multiply this probability by 180 days to find the expected number of days a certified teacher is on bus duty: (36/80) * 180 = 81 days.

Thirty-Six of the Staff of 80 Teachers at a Local