A study of a local high scheel tried to determine the mean number of text
messages that each student sent per day
. The study surveyed a random
sample
of SB students in the high school and
found a mean of 190 messages sent per
day with a standard deviation of 72 messages
. At the 95% confidence level,
find the margin of error for the mean,
rounding to the nearest whole number
.
(De not write)