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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

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

Life, Years	5	6	7	8	9	10	11	12
Probability	0.1	0.15	0.2	0.15	0.2	0.1	0.05	0.05

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