**Answer:**

We can say at 99% confidence that the true mean is between (91.674;98.326)

**Step-by-step explanation:**

**Data given**

represent the sample mean

population mean (variable of interest)

s=6.6 represent the sample standard deviation

n=30 represent the sample size

The confidence interval for the mean is given by the following formula:

(1)

We need to find the critical value and we need to find first the degrees of freedom, given by:

Since the Confidence is 0.99 or 99%, the value of and , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.005,29)".And we see that

And replacing we got:

We can say at 99% confidence that the true mean is between (91.674;98.326)

Well, since 1 quart equals 4 cups, multiply 7 by 4.

You'll get 28 cups.

Now add te 2 cups, and you get 30.

So: 7 quarts, 2 cups = 30 cups.

6,240 I think ??

If you need help let me know