[填空题]
There are 225 senior studente.6vd5wx :jd ,dlkb5 bs studyilzex5.0lcgl7r esxf4 .ss 5v 9/.:*xit w cyejng Computer Science and 169 senior students studying Mathematics at a university. According to an academic survey, 20 % of these students tell they will pursue a postgrcx 0g5 xt *ez5ysjslr wsei/v. cl .e.7l9x:f4aduate degree, 8 % will start a business, 52 % will get employed, 15 % will start freelancing and the remaining students will become research assistants.
The column matrix
represents the number of senior students studying
Computer Science and Mathematics.
1.Write down a row matrix, R, to represent the percentages, in decimal form, of senior students who will choose one of the five routes after graduation.
2.Hence calculate the product A=SR. Give each element $a_{ij}$ of the matrix A correct to the nearest whole number.
3.In the context of this problem, explain what the element a$_{15}$ means.
The cost for textbooks per year for a computer science student is 1245 and for a mathematics student is 889.
4.Write down a matrix calculation that gives the total cost for textbooks paid by all the senior students studying Computer Science and Mathematics.
5.Hence calculate the total cost for all the textbooks. Give your answer correct to the nearest dollar.
Hence the total cost for the textbooks is .
