这道题真的好难啊~~有没有大大帮个忙啊。。。。

a combination of a “do while” loop and a “for” loop ,calculate the following formula

for various sets of numbers.you must apply the “ do while ” loop to enable the user to try different sets of numbers and the“ for ” loop to calculate the formula for each set and print the result to the screen.generate set of numbers with the use of the standard  library function rand () and follow the user to set the upper range of numbers in the set。

还有图。。。发不上来  我描述一下，k=1,m=k, 两个西格玛在这两个等式上，然后后面是（Xk+K）/m，我完全晕掉了。。。。求教，解释一下也OK

就是没公式。。。就告诉了我。。sum of (Xk+K)/m

...真是搞不懂。。。为什么老师要虐待我这个菜鸟。。。。