In 2018, the U.S. Department of Agriculture issued a report (http://www.cnpp.usda.gov/ sites/default/files/CostofFoodNov2018.pdf) indicating a family of four spent an average of $1,054.50 per month on food. This is for a family of four (two parents aged 19 to 50) and two children (one whose age is between 6 and 8 years and one between 9 and 11 years). Assume the distribution of food expenditures for a family of four follows the normal distribution with a standard deviation of $120 per month.
a. What percent of the families spend more than $900 but less than $1,054.50 per month on food?
b. What percent of the families spend less than $900 per month on food?
c. What percent spend between $900 and $1,200 per month on food?
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