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

Question

Quizplus · Accepted Answer

The probability that a teacher is certified in CPR is 36/80 = 0.45. Over 180 days, the expected number of days a certified teacher is on duty is 0.45 * 180 = 81 days.

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