Question 911665
p(asthma) = .30, n = 12
P(x ≥ 3) = 1 - P(x ≤ 2) = 1 - binomcdf(12, .30,2)  Using TI Calculator
P(x = 3) = binompdf(12, .30,3)  Using TI Calculator
by Hand:
Using {{{P (x)= highlight_green(nCx)(p^x)(q)^(n-x) }}} 
p and q are the probabilities of success and failure respectively. 
In this case p= .30 , q = .70, n = 12 
{{{nCx = (n!)/x!(n - x)!)}}} 
for ex:
P(x = 3) = {{{P (x)= highlight_green(16C3)(.30^3)(.70)^(9) }}}