Question
The mean weight of 40 students is 50 kg. One of the student leave and is replaced by another student which reduces the mean weight of the class by 0.5 kg. If the weight of the student who left is 65kg, what is the weight of the student who joined the class.
Answers
Mean = Σx/n
50 = Σx/40
Σx = 2000
49.5 = (2000-65+x)/40
Solve for x.
50 = Σx/40
Σx = 2000
49.5 = (2000-65+x)/40
Solve for x.
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