The average of 11 numbers is 10.9. If the average of first six is 10.5 and that of the last six is 11.4 the sixth number is ?
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Step-by-step explanation:
Middle numbers
= [(10.5 x 6 + 11.4 x 6) - 10.9 x 11]
= (131.4 - 119-9)
= 11.5.
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