HELP
...an auto part has 95% chance of being made within its tolerance level and a 5% chance of bieng pulled as defective.what is the probability that in a box of 8 parts,no more than 1 is defective.
a.9.43
b.0.66
c.0.94
d.0.28

Question

HELP
...an auto part has 95% chance of being made within its tolerance level and a 5% chance of bieng pulled as defective.what is the probability that in a box of 8 parts,no more than 1 is defective.
a.9.43
b.0.66
c.0.94
d.0.28

anonymous · Answer

clearly here n=8 and p=.05(for defective) and q=0.95(not defective)
we need to find f(0)+f(1)  (using Brnouli trial's formula)
where probability of r success is given by f(r)=C(n,r) * (p^r) * (q^(n-r))