Manufactured articles are packed in boxes each containing 200 articles & on average 1.5% of all articles manufactured are defective. A box which contains 4 or more defective articles is substandard. Using a suitable approximation show that the probability that ta radomly chosen box will be substandard is 0.353. (Dont need to answer this part)
A lorry load consists of 16 boxes randomly chosen. Find the probability that a lorry load will include at most 2 boxes which are substandard. Ans: 0.043 (Dont need to answer this part)
A warehouse holds 100 lorry loads. Show that correct to 2 decimal places the probability that exactly 1 of the lorry loads in the warehouse will include at most 2 substandard boxes is 0.06. (Just need to answer this part)