Hi,

Five out of 50 people called to give money to a charity actually agrees to give money.  p(success) = 5/50 = .1

BINOMIAL Distribution P(x) = nCx*  

where p and q are the probabilities of success and failure respectively. 

In this case p = .10 & q = .90 & n = 25   nCx = 

For ex:   P(x = 25) =

Recommend using Your TI calculator for cumulative probabilities.

and stattrek.com as an excellent reference. 

what is the probability that out of the next 25 people called:

a. At least two agree to give money? P(x≥2) = 1 - binomcdf(25, .10, 1)

b. At most 5 agree to give money?  P(x≤5) =  binomcdf(25, .10, 5)

c. More than 3 agree to give money? P(x>3) = 1 - binomcdf(25, .10, 3)

 

 

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