Answer:
YES, there are 88% chances that no more than one of them is afraid of spider.
If there is group of 11 teenager in tent, then there is chance that 2 0r more teenager will be afraid of spider.
Step-by-step explanation:
Let A11 be the number of teenager. We want no more than one teenager in each tent is afraid of spider
P (C11≤1) = P (C11=0) + P (C11=1)
= (11C0) 0.070. (1- 0.07)10 + (11C1). 0.071. (1- 0.07)10-1
= 0.88
= 88 %
Yes, it seems reasonable for him to randomly assign teenagers to tents.
There are 88% chances that no more than one of them is afraid of a spider, remaining are in his favor, and he can randomly assign.
If there is a group of 11 teenagers intent, then there is a chance that two 0r more teenagers will be afraid of a spider.
Probability = P (C11≤2)
= P(C11 = 2) + P (C11=3) + P(C11 =4) + ……
(Probability is somewhat large)