Question 1133327
the mean is sum/5 or 32/5 or 6.4
the median is middle of ordered numbers 3/5/7/8/9 or 7
mean of lower half is first quartile or 4
mean of upper half is third quartile or 8.5
SD is sqrt (3.4^2+1.4^2+1.6^2+0.6^2+2.6^2)/4=2.41