My Math Forum PROBALITY HELP!

 Algebra Pre-Algebra and Basic Algebra Math Forum

 February 16th, 2012, 01:07 PM #1 Newbie   Joined: Feb 2012 Posts: 18 Thanks: 0 PROBALITY HELP! TASK: X is the number of live lambs from a pregnant ewe. X is a random variable with the following probability distribution. Value of X: 0 1 2 3 Probability: 0.05 0.20 0.70 0.05 a) What is the expected lamb numbers and what is the standard deviation? b) Suppose you have 2 ewes. What is the expected total lamb numbers? What is the variance and standard deviation (assuming independence between ewes)? What is the probability that you do not get any lambs? What is the probability that you get 6 lambs? Its the last two questions i have problems with: What is the probability that you do not get any lambs? What is the probability that you get 6 lambs?
 February 16th, 2012, 02:16 PM #2 Senior Member   Joined: Oct 2011 From: Belgium Posts: 522 Thanks: 0 Re: PROBALITY HELP! a) the expected lamb numbers=$0.05*0 + 0.20*1 + 0.70*2 + 0.05*3$ standard deviation=$\sqrt{0.05*0 + 0.20*1 + 0.70*4 + 0.05*9 - (0.05*0 + 0.20*1 + 0.70*2 + 0.05*3)^2}$ b) What is the probability that you do not get any lambs=0.05*0.05 What is the probability that you get 6 lambs=0.05*0.05

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