Answer:
Option A - Yes this probability model is valid.
Step-by-step explanation:
Given : Sherwin manages Delaroy County Zoo. The following table shows a probability model for the number of visitors on a weekday.
To find : Is this a valid probability model?
Solution :
Probability Model
Number of visitors Probability
     0-49          0.12
     50-99            0.26
    100-149           0.32
    150-199           0.21
      200+           0.09
The property of probability is total sum of the probability of an event is always 1.
So, we find the sum of the probability,
i.e. P=0.12+0.26+0.32+0.21+0.09=1
It satisfy the property.
Therefore, Option A - Yes this probability model is valid.
