A group of 19 students registered for a speed-reading class at a
local community college. On the first day of class, students were
timed as they read a passage from a novel. The mean time of all the
students was 189 minutes with a standard deviation of 21 minutes.
Six months later, the students were timed again as they read a
passage of similar length and readability level. Each student in
the course lost exactly 10 minutes on their reading times. What are
the values of the new mean and standard deviation of the students’
reading times?
mean = 179 minutes and standard deviation = 11 minutes
mean = 179 minutes and standard deviation = 21 minutes
mean = 179 minutes and standard deviation = 31 minutes
mean = 189 minutes and standard deviation = 11 minutes
mean = 189 minutes and standard deviation = 21 minutes