还是英文的统计学问题
weekly demand at a grocery store for a brand of breakfast cereal is normally distributed with a mean of 800 boxes and a standard deviation of 75 boxes.
a) what is the probability that weekly demand is more than 959 boxes?
b) what is the probability that weekly demand is between 650 boxes and 950 boxes?
c) the store orders cereal from a distributor weekly.how many minimun of boxes should the store order for a week to have at most a 1% chance of running short of this brand of cereal during the week?
d).what is the probability that a segment of 6 brands in the grocery store have a weekly mean demand that is greater than 900 boxes?
我是在问统计学 不是翻译