Answer: z-test for population mean.
Step-by-step explanation:
Given : purchase of a coin-operated laundry. The current owner claims that over the past 5 years, the average daily revenue was $675 with a standard deviation of $75.
So the null hypothesis and alternative hypothesis will be :-
![H_0:\mu=\$675\\\\ H_a:\mu\neq\$625](https://tex.z-dn.net/?f=H_0%3A%5Cmu%3D%5C%24675%5C%5C%5C%5C%20H_a%3A%5Cmu%5Cneq%5C%24625)
It means the test will be for population mean.
We assume that this is normally distributed.
We know that we use t-test for sample size less than 30 and z-test for sample size greater than 30 .
Since the sample size is 30, so the test use here is z-test for population mean.
Answer: 192
Step-by-step explanation:
3 x 8 = 24
24 x 8 = 192
values of the variable that cause the polynomial to evaluate to zero.