Answer:
There is a 82% probability that th esample mean annual sales per square foot is at least $384.
Step-by-step explanation:
We have a population with mean 390 and standard deviation 45.83.
Samples of size n=49 are taken.
The parameters of the sampling distribution are:

First, we have to calculate the z-score that satisfies:

This z-score, looked up in a standard normal distribution table, is z=-0.915.
Then, we can calculate the sample mean as:

There is a 82% probability that th esample mean annual sales per square foot is at least $384.
40/16 or 2.5 meters per second.... Sorry I'm probably way too late
You would take the answer of the square root problem and find the number that you can multiply by its self that would make that answer correct.
Answer:
n < 42
Step-by-step explanation:
450 + 25n < 1500 (Has to be less than 1500)
25n < 1500 - 450
25n < 1050
n < 42