Answer:
one has (_) and another has (+)
A)
Let X be the food expenditure of a family.
Let the population mean of an expenditure of a family be.
Let the population standard deviation of an expenditure of a family be.
The proportion families spend more than $30 but less than $490 per month on food is,
The answer is
15m^2n + 4/n
Hope that helps, have a nice night or day <4
