Asked by Victor
The mean height of three groups of students consisting of 20, 16 and 14 students are 1.67m, 1.50m and 1.40m, respectively. Find the mean height of all the students.
Answers
Answered by
oobleck
form the weighted average:
(20*1.67 + 16*1.50 + 14*1.40)/(20+16+14)
(20*1.67 + 16*1.50 + 14*1.40)/(20+16+14)
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