Answer:
a. [0.137, 0.503]
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of
, and a confidence interval
, we have the following confidence interval of proportions.

In which
z is the zscore that has a pvalue of
.
For this problem, we have that:
A sample of 25 students in the lab, of whom 8 smoke. So 
95% confidence interval
So
, z is the value of Z that has a pvalue of
, so
.
The lower limit of this interval is:

The upper limit of this interval is:

The correct answer is:
a. [0.137, 0.503]
Answer:
a. 21 2/6
Step-by-step explanation:
5 2/6 multiplied by 4 is 21 2/6
Answer:
ok
Step-by-step explanation:
B: 4.75+0.75n ≥25
Because she has already spent 4.75 and she only has $25 and she cannot spend more than$25