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MATHEMATICS

JAMB 2002 - Question 48

Mathematics 2002 JAMB Past Questions - Question 48: The mean of a set of six number is 60.if the mean of the first five 50,find the sixth number in the seat

Choose the most appropriate option for the gap .

The mean of a set of six number is 60.if the mean of the first five 50,find the sixth number in the seat

A: 105

B: 100

C: 95

D: 110

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Correct Answer

Explanation

x = Ex / N = 60 = Ex /6Ex = 60 x 6 = 360; Y = Ey /N 50 = Ey /5Ey = 50 x 5 = 250therefore the sixth number in the set = Ex- Eytherefore the sixth number in the set = Ex= 360 -250 = 110