The haemoglobin levels in the blood of 45 hospital patients were measured. The results, correct to 1 decimal place, and ordered for convenience, are as follows.
9.1 10.1 10.7 10.7 10.9 11.3 11.3 11 4 11.4 11.4 11.6 11.8 12.0 12.1 12.3 12.4 12.7 12.9 13.1 13.2 13.4 13.5 13.5 13.6 13.7 13.8 13.8 14.0 14.2 14.2 14.2 14.6 14.6 14.8 14.8 15.0 15.0 15.0 15.1 15.4 15.6 15.7 16.2 16.3 16.9
(a) Form a grouped frequency table with eight classes.
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