Homework Help: statistics

Posted by Sarita on Saturday, April 9, 2011 at 5:57pm.

According to a survey 35% of adults are against using animals for research. Assume that this result holds true for the current population of all adullts. Let X be the number of adults who are against using animals for research in a random sample of 2 adults.
Find the probability distribution of X

statistics - drwls, Saturday, April 9, 2011 at 7:50pm
P(0) (the probability none are against) = (0.65)^2 = 0.4225
P(1) = 2*(0.65)(0.35) = 0.4550
P(2) (both against) = 0.1225

The sum is 1.00

The "expectation value" (the average of many trials) is 0.70

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