Answer:
I believe that the general store offers a better deal.
Answer: $1.13 or $1.125
Step-by-step explanation:
divide 18 by 16
Answer:
20 min for 40 shirts, two shirts a minute
Part a is correct.
Part b can be done a couple ways.
1) Use binomial distribution. p = 0.2, n = 144
P(x>3) = 1 - P(x=0) -p(x=1) -p(x=2) -p(x=3)
where

2) Assume a normal distribution with mean = 28.2, stdev = 4.8

Look up z-value in normal table to find probability.
Hope that helps.