Is your roller coaster a function? Why or why not?

yes

Step-by-step explanation:

The minimum sample size required for the estimate is 345.

Step-by-step explanation:

We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:

Now, we have to find z in the Ztable as such z has a pvalue of .

That is z with a pvalue of , so Z = 1.96.

Now, find the margin of error M as such

In which is the standard deviation of the population and n is the size of the sample.

The standard deviation is known to be 1.8.

This means that

What is the minimum sample size required for the estimate?

This is n for which M = 0.19. So

Rounding up to the next integer:

The minimum sample size required for the estimate is 345.