divide total miles by time:
157.5 / 2.5 = 63 miles per hour
Answer:
3
Step-by-step explanation:

Answer:
y=x^28x+31
Step-by-step explanation:
Answer:
1/6
Step-by-step explanation:
Answer:
We have to find the 90% confidence interval for the mean
Given sample size
Sample mean
Population standard deviation
Here the confidence level is 90% then
And
The 90% confidence interval is
Here is the critical value at 0.05
From the tables
Now the 90% confidence interval is =
=
=(3840.44, 4133.56)
Hence the 90% confidence interval for the mean is (3840.44, 4133.56)