Answer:
d. 188.4 in
Step-by-step explanation:
i might be wrong so sorry in advance.
Answer:

Step-by-step explanation:
Given

-- City C
--- City K
Required
Determine the 90% confidence interval
This is calculated using:

Calculating 




For a 90% confidence level, the z-score is 1.65. So:

Calculating the standard deviation 

So:


So:


Answer:
c correct
Step-by-step explanation: