Question

a surgical technique is performed on seven patients. You ate told there is a 50% chance of success. Find the probablity that the surgery is successful for more than 4 patience

Answer 1

n=7

p=0.50

q=1-0.50 =0.50

r=4

P(x=r) = nCr p^r q^(n-r)

P(x>4) = 1-P(x<= 3)

               =1- {=BINOM.DIST(3,7,0.5,TRUE)} .... using excel formula             

               =1-0.5

               =0.5