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,
Answer:
the answer 0.4
Step-by-step explanation;
Put the equation given in the form
The center will be (-f, -g)