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leomcintyre12
24.10.2019 •
Mathematics
Aconsultant has three sources of income—from teaching short courses, from selling computer software, and from advising on projects. his expected annual incomes from these sources are $7,000, $22,000, and $50,000, and the respective standard deviations are $3,000, $4,000, and $18,000. assuming independence, find the mean and standard deviation of his total annual income.
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Ответ:
Mean = $79,000
Standard deviation = $25,000
Step-by-step explanation:
Data provided in the question:
Expected annual incomes:
From teaching short courses = $7,000
From selling computer software = $22,000
From advising on projects = $50,000
Standard deviation:
teaching short courses = $3,000
selling computer software = $4,000
advising on projects = $18,000
Now,
it is given that the events are independent
therefore,
Mean = ∑(Expected annual income)
or
Mean = $7,000 + $22,000 + $50,000
or
Mean = $79,000
also,
Standard deviation = ∑(standard deviation)
or
Standard deviation = $3,000 + $4,000 + $18,000 = $25,000
Ответ:
I actually think the first one is 60 because 90 is about straight up and it is slightly tilted
Step-by-step explanation:
welcome