Answer:
standard error of the mean = 1.6960
Step-by-step explanation:
Given -
Mean
= 53 minutes
Standard deviation ( s ) = 53.9 minutes
n = 1010
standard error of the mean =
=
= 
= 1.6960
Least value:16
Median:26
Greatest value:34
I would combine then solve.
Y/12+6=-72 Y/12=-78 Y=-6.5