a bottling company has determined the number of

Question

A bottling company has determined the number of machine breakdowns per month and their respective probabilities as given below:

    Number of
    Breakdowns        Probability
    0                         0.12
    1                         0.38
    2                         0.25
    3                         0.18
    4                         0.07

The expected number of machine breakdowns per month?  Describe your answer.