quantize economics question

The weights of hamburgers have a normal distribution with mean 105 grams and standard deviation 2.5 grams. Hamburgers Iweighing less than 10o grams are sold as \"specials\" for $200, while those over 125 grams are sold as \"bonus burgers" for $2.30. The remaining hamburgers are used for regular burgers, selling for $2.51]. [a] Assume all sizes of hamburgers can be sold. Find the average selling price for a hamburger. {b} Calculate the probability that the total weight of 2 randomll,r chosen hamburgers exceeds 225 grams. [:1 Find the approximate probability that a shipment of15 hamburgers will contain at least #0 suitable for use as \"specials\