Experts agree that early diagnosis of autism spectrum disorders (ASD) is important so children get the support they need to develop, progress, and thrive. The National Center for Biotechnology Information conducted a study in which the ages at diagnosis for a random sample of 421 children with ASD were recorded. The average age was 38.2 months with a standard deviation of 8.7 months. Estimate the mean age at diagnosis for children with ASD with 96% confidence.

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

the surface area is 124cm²

step-by-step explanation:

length: 4cm

width: 9cm

height:   2cm