Please help. I am getting different answers

Statistics
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Question text

A wildlife biologist observes four brown bears as they attempt to catch salmon in a river in Alaska.  Assume that each bear has a .7 probability of catching a fish and that the bears fishing attempts are independent.  Let the random variable X be the number of bears that catch a fish.  Create the probability distribution for X (rounding each to THREE decimal places).

What is the standard deviation of the above distribution?  Round to three places.

Jul 3rd, 2015

Thank you for the opportunity to help you with your question!

This is a binomial pdf

n=4; p=.7 q=.3    x=number of bears that catch a fish

P(x) =    Combin of 7 taken x *.7^x *.3^4-x

the standard deviation of the above distribution = SQRT(npq) = SQRT(4*.7*.3) = .917


Please let me know if you need any clarification. I'm always happy to answer your questions.
Jul 3rd, 2015

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