Homework Help: statistics

Posted by shweta on Wednesday, February 15, 2012 at 11:57pm.

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.

statistics - PsyDAG, Thursday, February 16, 2012 at 12:08pm
Mean = Σx/n

50 = Σx/40

Σx = 2000

49.5 = (2000-65+x)/40

Solve for x.

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