The monthly amounts spent for food by families of four receiving food stamps approximates a symmetrical, normal distribution. the sample mean is $150 and the standard deviation is $20. using the empirical rule, about 95% of the monthly food expenditures are between what two amounts?
a. $205 and $220
b. $85 and $105
c. $100 and $200
d. $110 and $190

see attached

step-by-step explanation:

given the function as;

write the equation replacing f(x) with y

form   and fill a table containing values of y with corresponding values of x

you can take a range for   values of x as -3≤x≤3

solving for x=-3

for x=-2

repeat the same procedure to get the values of y for the remaining ,x=-1 to x=3

plot the values of y against values   of x and obtain the following graph