Answer:
The last graph
Step-by-step explanation:
See attached image
Answer:
We want to construct a confidence interval at 99% of confidence, so then the significance level would be
and the value of
. And for this case since we know the population deviation is not appropiate use the t distribution since we know the population deviation and the best quantile assuming that the population is normally distributed is given by the z distribution.
And if we find the critical value in the normal standard distribution or excel and we got:

And we can use the following excel code:
"=NORM.INV(0.005,0,1)"
Step-by-step explanation:
For this case we have the following info given:

We want to construct a confidence interval at 99% of confidence, so then the significance level would be
and the value of
. And for this case since we know the population deviation is not appropiate use the t distribution since we know the population deviation and the best quantile assuming that the population is normally distributed is given by the z distribution.
And if we find the critical value in the normal standard distribution or excel and we got:

And we can use the following excel code:
"=NORM.INV(0.005,0,1)"
Answer:
x = 43
Step-by-step explanation:
3x - 31 = 2(x+6)
3x - 31 = 2x+ 12
x =43
B. A smaller percentage of second-lunch students (38%) eat outside.
Answer:
Jose's solution is not correct, the auditorium has
rows
Step-by-step explanation:
we have

where
f(x)------> is the total number of seats in an auditorium
x----> represents the number of rows
How many rows are there in the auditorium if it has a total of 416 seats?
Find the value of x for f(x)=416 seats
substitute the value of f(x) in the equation


Using a graphing calculator
The values of x are 
The solution is
x=16 rows because the number of rows can not be a negative number