The answer would be -6 or letter B because
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.= 
124, just times 2 because it said bisect
(1.35)(27)= 36.45(0) = 0 (13) = 13
R could equal any number, but it has to be higher than 4, because 3+4=7.