A student's marks in five tests are 36%, 78%, 67%, 88% and 98%. The weights for the five tests are 1, 2, 2, 3, 3 respectively. Find the weighted mean μ of the five tests.
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Answer:
Let x be the 6th observation
⇒45+54+41+57+43+x=48×6=288
⇒x=48
Variance =(6∑xi2−(Xˉ)2)
⇒ variance =614024−(48)2
=3100
⇒ standard deviation =310
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Answer:
the answer is 11 because 1'2'2'3'3+
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