Help with normal distribution problem?

I have to carry the question of art in this issue of the normal distribution. I understand that works "backwards", using the inverse probability tables. And help is greatly appreciated, and lots of thanks in advance. The good question is: The weight of flakes OATI cereal packets are normally distributed with an average of 425 grams and a standard deviation of 4 grams. A pallet delivered a large supermarket contains 495 packets of flakes OATI. One day, 275 parcels are checked and 2 are to be very light. If the machine is operating normally what is the maximum weight of packages based on this very light sample? 13. Calculate the average weight of the machine should be set at 85% as packages of cereal flakes OATI exceed 425 grams. Thanks!

Lack of definition of "very easy" – but I would say it must be defined as less than 5% chance of a very lightweight package in the sample. That would mean an opportunity = 0.000182 1/275/20. Using this definition of az table is weighing 410.75 grams. 13. With a standard deviation of 4, the average packet size should be 429.1457 link below contains z handheld calculator

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