The 99% confidence interval for the true mean is given by:
where:
is the sample mean = 69.7
is the standard deviation = 2.8
is the test statistics = 2.58 for for 99% confidentce interval.
n is the sample size = 772.
Therefore, the 99% confidence interval is:
Multiply both sides by 2 to clear the fraction.
-3x + 6 <= 24
subtract 6 from both sides.
-3 x <= 18
divide both sides by -3, since you're dividing an inequality by a negative number you have to change the direction of the inequality sign.
x >= -6
0.9 divided by 3.6 is 0.25
13*2.50=32.5.
Now he sales baseball cards at 0.75.
So 40.75-32.5=8.25. So I can do this in many ways, but I'll start with the easiest. 8.25/0.75=11. Does this add up? 0.75*11=8.25. Yes, it does!
So your answer is D.
brainliest if possible?
