A hint to get started
Carry an underweight-chocolate event into a box count
A factory produces chocolate which are packed into boxes of 20 and delivered to shops for sale. A chocolate will not meet the minimum criteria for packing for sale if it weighs less than 20 grams. On average, 2% of the chocolate produced did not meet the minimum criteria.
(i) Find the probability that a randomly chosen box contain at least 1 chocolate that does not meet the minimum criteria. marks
(ii) Find the probability that out of 4 randomly chosen boxes of chocolate, there are exactly 2 boxes with at least 1 chocolate that does not meet the minimum criteria. marks
[2007/TPJC/II/5]
CJC · Review Problems · Question 8
Distinguish a chocolate being underweight from a box containing an underweight chocolate.