Can someone help me with these questions please!!!?

Question 7 (1 point)


Q3 - 7


On average a machine breaks down 1.0 times in any year what is the standard deviation of the number of breakdowns in a year?





Answer:





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Question 8 (1 point)


Q3 - 8


Which of the following are continuous random variables? Tick all that apply.





a. The outcome of a roll of a dice


b. Mean time between failures of a machine


c. From a national census, the number of people in a census tract


d. The number of failures per year of a machine


e. The weight of a person





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Question 9 (1 point)


Q3 - 9


Given a probability density function, f(x), how can you find the probability of a value lying between two limits a and b, b %26gt; a





a. (f(b)-f(a))/(b-a)


b. f(b) – f(a)


c. Area under curve f(x) from a to infinity minus area under curve from b to infinity


d. Integral of f(x) with respect to dx





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Can someone help me with these questions please!!!?
the first question seems to be poisson...


the mean is 1


then the standard deviation is 1 also... (if im not mistaken)








continuous rv: mean time between failures ... weight of person.








question 9. for a continuous r.v. it would be letter c.








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