Answer:
(22.12, 27.48)
Step-by-step explanation:
Given : Significance level : 
Sample size : n= 8 , which is a small sample (n<30), so we use t-test.
Critical values using t-distribution: 
Sample mean : 
Standard deviation : 
The confidence interval for population means is given by :-
i.e. 
Hence, the 95% confidence interval, assuming the times are normally distributed.= (22.12, 27.48)
Answer:
The mid-point is (9,-9/2)
Step-by-step explanation:
You would use the mid-point formula for this
if you plug that in it is (
)
resulting in (11/2,-2/2) = (11/2,-1)
-17/15
Find a common denominator, and multiply the numerator by the same factor. Don't forget that adding a negative is really subtracting.
Answer: 75(b-4)=450
Step-by-step explanation: She doesn't have to pay for four books, so the number of books she is going to have to pay is b-4. Each of these books costs $75. To conclude, b-4 books cost 75(b-4).
Hope this helps you out! ☺
