A new antibiotic is effective for 85% of infections the antibiotic is given to 40 patients what is the probability the antibiotic will work in less than half of the participants?
I think that this is a very long winded answer
you must work out the probability of 0 than 1 then.... all the way up to 19
sum of r from 0 to 19 of
40Cr * 0.85^r * 0.15^(40-r)
I apologise for the presentation.
I am on my phone
