Answer:
476
Step-by-step explanation:

because there are 68calories per serving and there are 7 servings
If the truck is 14,000 pounds and increases by 2 tons yes. However if it is above 14,000 then no it will not be a class 4 truck.
Answer:
(25.53, 37.87): 95% CI
(23.59, 39.81): 99% CI
Step-by-step explanation:
The margin of error of a confidence interval is given by:

In which
is the standard deviation of the population and n is the size of the sample.
z is related to the confidence level. The higher the confidence level, the higher the values of z, and thus, we wider the confidence interval is.
In this question:
The narrower C.I. is the 95%, and the wider is the 99%. So
(25.53, 37.87): 95% CI
(23.59, 39.81): 99% CI
I do not see an illustration.