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Expected Value of Umbrellas Using Historical Data

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ABC Company is selling the umbrella which sells direct to the customers.

It has established that the historical data as below:
Umbrella's demand per month Frequency
200 2
300 6
400 8
500 12
600 18

Try to find:

What is the expected umbrella's demand per month?

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This solution helps with a question about expected value of umbrellas using historical data.

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"In probability theory, the expected value (or expectation, or mathematical expectation, or mean, or the first moment) of a random variable is the weighted average of ...

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