Question: When a construction project is opened for bidding, two proposals are received with probability 0.11, three proposals are received with probability 0.19, four proposals are

When a construction project is opened for bidding, two proposals are received with probability 0.11, three proposals are received with probability 0.19, four proposals are received with probability 0.55, and five proposals are received with probability 0.15.
(a) What is the expectation of the number of proposals received?
(b) What is the standard deviation of the number of proposals received?

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