Answer:

If we divide both sides by
we got:

And we can use the normal distribution table or excel to find the probabilites and we got:
Step-by-step explanation:
Previous concepts
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".
Solution to the problem
Let X the random variable that represent the area of a population, and for this case we know the distribution for X is given by:
Where
and 
We select a a sample of n =4 and since the distribution for X is normal then we know that the distribution for the sample mean
is given by:

And we want to find this probability:

If we divide both sides by
we got:

And we can use the normal distribution table or excel to find the probabilites and we got:

I think the answer is d or b if im wrong sorry hope this helped tho :p
Answer: you could do store A is $8 per hour, and thirteen $13 per day, store B can be $3 per hour, $18 per day
I'm not too confedent but I'm still happy to help!
Sort the pentagon into 5 triangles and then solve for each one
Answer:
Step-by-step explanation:
b/7<23