Pls help with this!! A recent report in USA Today indicated a typical family of three
spends 420$ per month on food. Assume the distribution of food
follows the normal distribution with a mean of 420$ and a standard
deviation of 40$. What percent of the families spend more than 170$
but less than 670$ per month on food? What percent of the families
spend less than 380$ per month on food? What percent of the families
spend more between 400 and 500$ per month on food?