Probability that products won't pass the test is 0.01. Calculate the probability among 200 of such products - at least 2 won't pass the test.
a) Provide a formula for exact probability
there is one more point here i have no idea how to translate let me try though
Provide formula for probability of approximate distribution of a)
If that makes sense, great otherwise please help me with the first one.
Would it be:
p=0.01 n=200 EX=2
D²(X) = npq = 200*0.01*0.99 ?
Because going like:
100 choose 4 * (5/100)^4 * (95/100)^4 + 100 choose 5 * (5/100)^5 * (95/100)^5 +.....=
this would seem to be so much of an effort to calculate that even on a calculator?