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The probabilities that the life of a machine will vary from 6 to 12 years are given in the table below

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The probabilities that the life of a machine will vary from 6 to 12 years are given in the table below. Determine the expected life of the machine and the standard deviation (20 points) Life , Years5 6 7 8 9 10 11 12 Probability 0.100.150.20.150.200.100.050.05