SOA Exam P Sample Question 567
Study guide: Exam P-1
A company tests five batteries. Each battery has a probability p of being defective, where p is a constant. The events of different batteries being defective are mutually independent.
The number of defective batteries out of the five batteries is a random variable, N, where E(N^2) = 1.80.
Calculate \text{Var}(N).
- A)
0.80 - B)
0.98 - C)
1.15 - D)
1.67 - E)
1.80
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