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Unregistered
22nd May 2006, 05:46 PM
the random variableX has a B(60,0.02) distribution. use an appropiate approximation to find P(X<or equal 2)
MathsMan
22nd May 2006, 10:53 PM
B(60,0.02) distribution. use an appropiate approximation to find P(X<or equal 2)

Since n>50 and p<0.1 use the Poisson approx to the Binomial

ie λ=np = 60 x 0.02 = 1.2

X~Po(1.2)

P(X≤2) = 0.8795 (from tables)