Of the members of a Boy Scout troop, 15% have received their first aid badge. If 40 boy scouts are selected at random, find the probability that four or more will have the first aid badge?
A) 86.65%
B) 85.35%
C) 36.65%
D) 35.35%

Question

Quizplus · Accepted Answer

Using the binomial probability formula: 
P(X ≥ 4) = 1 - P(X ≤ 3)
= 1 - binomcdf(40,0.15,3)
= 86.65% (rounded to two decimal places)

Of the Members of a Boy Scout Troop, 15% Have