Proportion of defective pens


A pen packets contains defective pens, the exact number of which is not known. a samle of 500 from the packets gives 80 defective pens. find the limit for the proportion for the 0 defective pen in the packet.


It is given that for 500 pens there are 80 defective pens
According to that , there are 16% of the pens must be defective
so, for 6 pens the defective pens are 0.8
since pens can’t be decimal they are integers.
So, for 6 pens there cannot be any defective pens