Question 1178125
the mean is 11.34
s is 2.25
the 95% half-interval is t (0.975, df=9)*s/sqrt(n); t=2.262
=2.262*2.25/sqrt(9)=1.70
add to and subtract from mean
(9.64 min, 13.04 min)
C
If you really get stuck, the smaller number is before the larger. That leaves A and C.