Answer: 
Step-by-step explanation:
As per given , we have
n = 11

Since population standard deviation is missing, so we use t-test.
Critical t-value for 99% confidence :
[using two-tailed t-value table]
Confidence interval :

Hence, 99% confidence interval for the mean amount of time that students spend in the shower each day.= 
Answer:
what school?
Step-by-step explanation:
The answer is -3.25 is greater :)
Answer:
36 km
Step-by-step explanation:
60% of 60km
60/100
.6*60=36
36 km