Need someone to check
posted by Anonymous .
It is known that about 20% of car insurance policies include emergency road service. Suppose we randomly select 10 car insurance policies.
What is the probability that at least one policy will have emergency road service?
Answer
0.6242
0.3758
0.8926
0.2684
0.1074
What is the expected number of policies having emergency road service?
Answer
3.5
8.0
1.6
2.0
5.0
I couldn't figure out the second part. for the first one i got .3758

Math?? 
Writeacher
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probability 
drwls
How did you get 0.3748 for part 1? The correct answer is 1  (0.8)^10
One minus the probability that none of the ten have roadside coverage
The expecation value is the singlepolicy probabiity x (number of policies). That product is 2.
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