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简述主存管理存储器的几种策略

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静态优先数是以静态的方式指派给进程优先数，简述几种确定静态优先数的策略。

简述分区分配的几种放置策略及特点

如果现在读写磁头正在65号柱面上执行操作，等待访问者按请求的次序排序，依次要访问的柱面为130、32、159、61、75。请写出依照SSTF算法，读写磁头处理的次序为？写出判断依据

Exercise 2An organisation is using linear regression analysis to establish an equation that shows a relationship between advertising expenditure and sales. It will then use the equation to predict sales for given levels of advertising expenditure. Data for the last five periods are as follows:What are the value of ‘∑x’ , ‘∑y’ and ‘ n’ that need to be inserted into the appropriate formula?

A. $600,000 $100,000 5
B. $100,000 $600,000 5
C. $600,000 $100,000 10
D. $100,000 $600,000 10