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Expected number of sightings

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3. The number of UFO (Unidentified Flying Object) sightings per week in Roswell, NM is a random variable with the cumulative distribution function given below.
x 0 1 2 3 4 5
F(x) .10 .30 .60 .80 .90 1.0
a. Find the probability that there are two or more sightings in a particular week.
b. Find the expected number of sightings in a week.

I calculated the answer to a: 1 - .30 = .70

But, I don't know how to calculate b.

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The expert examines the expected number of sightings.

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Since it is cumulative, we need to first calculate the individual probabilities

x fx

0 ...

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