Got my exam this afternoon, bit stuck.!
The question is:
"2% of a new model of mobile `phones are known to be defective. If a store orders a batch of 150 of these mobile 'phones what is the probability that
i) None are defective?
ii) 3 or more are defective?
I presume you have to use poisson, but if anyone can point me in the right direction, would be great.