The mean of 10 numbers is 12.5. The mean of first six numbers is 15 and the mean of last five terms is 10. Find the sixth number l.

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Solution

Mean of 10 numbers is 12.5

⇒ Sum of 10 numbers = 12.5 × 10 = 125

Mean of first 6 numbers = 15

⇒ Sum of first 6 numbers = 15 × 6 = 90

Mean of last 5 numbers = 10

⇒ Sum of las 5 numbers = 10 × 5 = 50

Hence sixth number = 125– (90 + 50) = -15

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Column I	Column II
(a) The mean of first 10 odd number =	(p) 11.2
(b) The mean of first 10 even numbers =	(q) 10
(c) The mean of first 10 prime numbers =	(r) 11
(d) The mean of first 10 composite numbers =	(s) 12.9

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