2. (09.07) A field test for a new exam was given to randomly selected seniors. The exams were graded, and the sample mean and sample standard deviation were calculated. Based on the results, the exam
creator claims that on the same exam, nine times out of ten, seniors will have an average score within 2% of 76%.
Is the confidence interval at 90%, 95%, or 99%? What is the margin of error? Calculate the confidence interval and explain what it means in terms of the situation. (10 points)

hdjd

step-by-step explanation:

$15 each

step-by-step explanation:

$45/3 children= $15 each

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

6x = 48

i hope this . 6 cards each and a total of $48. dvide each side by 6 and you will have your answer.