The mean heights of 3 groups of students consisting of 20, 16 and 14 students are 1.67m, 1.50m and 1.40m Respectively. What is the mean height of all the students?
-
A.
1.52m -
B.
1.53m -
C.
1.54 -
D.
1.55m -
E.
1.56m
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