1. A simple random sample of 500 students showed that the average weight of backpacks is 9 pounds
with a standard deviation of 3.5 pounds.
a. Find the margin of error for a 95% confidence interval.

b. Find the 95% confidence interval for the actual average weight of backpacks.

the answer is 288..

hope this

your answer is 228

step-by-step explanation:

add the top and bottom bases together, then divide them by 2, then multiply by the height.

overpriced

step-by-step explanation:

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204