Values in increasing order 42 46 51 53 66 70 70 90
Lower quartile : There are 8 observations If there are in observations, compute the lower quartile as follows: if n/4 is an integer, compute the lower quartile as (x[n/4]+x[n/4+1])/2 :: (x[8/ 4]+x[8 /4 +1])/2 if n/4 is not an integer, compute the lower quartile as x[k], where k is the smallest integer exceeding n/4:: 2 = 2 Lower Quartile : Average of observations 2 and 3 is -- = (46+51)/2 = 48
