Mean and standard deviation of total annual income

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A consultant has three sources of income- From teaching shot courses , from selling computer software, and from advising on projects. His elected annual income for these sources are $40,000, $25,000, and $18,000, and the respective standard deviations are $4,000, $5,000, and $6,000. Assuming independence , find the mean and standard deviation of his total annual income.

Reference no: EM131246216

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