iqr

the haemoglobin A test,a blood test given to diabetics during their periodic check-ups,indicate the level of control of blood sugar during the past two or three months.the following was obtained for 2 different diabetics at a university clinic that treats diabetic patients
6.5,5.0,5.6,7.6,4.8,8.0,7.5,7.9,8.0,9.2,6.4,6.0,7.7,6.1,8.8,4.2,5.9,8.3,4.0,8.7
a)calculate the interquartile range
b)construct the less then ogive
c)use the ogive to estimate the three quartiles
d)doctors reccomend a minimum blood sugar reading of 5.5.What conclusion can you draw from the blood sugar reading of the 20 patients?