matlab question

Honours are awarded on the basis of a "grand wam", an average mark over all units of study, weighted according to credit point value and according to the nominal year of each unit of study. The formula is GWAM-.GXCX Where M is the mark, C the credit point value and Y the year (values of 1, 2, 3 or 4). Honours are awarded as follows: Hl for GWAM 275, H2(1) for 75 >GWAM 270, H2(2) for 70 >GWAM 265. Write a function which will accept a 3-column matrix containing a mark, credit point value and year in each row and will return a value for the GWAM (it could consist of just one line) Joe obtained the following results: 1st Year 2nd Year 3rd Year 4th Year Mark CPMark CPMark CPMark CP 12 68 4 4 4 76 70 69 4 4 4 74 54 70 What grade of Honours will he be awarded? Answer: Second class, division 1