Explain"Suppose we approximate the demand of a randomly selected ATM user by the Normal distribution" is that mean that each variable has normal distributed, what information the right hand chart could give you? In this question any thing involving population v.s sample knowledge? and also in lecture professor wrote down two function which were E[ sum i=1,100 xi] V[ sum i=1,100 xi] what is xi represents under this context, each individual consumer's what index? could you write down two functions details?