Question

The average of a series of 21 members is equal to 43. The average of the first eleven of them is 33. The average of the last eleven numbers is 53. The eleventh number of the series

Answer 1

I don't know if this is entirely right.

Answer 2

The eleventh number of the series is 76

Step-by-step explanation:

average of first 11 members = 33

sum of the first 11 members = 33× 11 = 396

average of the last 11 members = 53

sum of the last 11 members = 53×11 = 583

average of 21 members = 43

sum of all the 21 members  = 21×43 = 903

therefore ,

11th number in the series = (396+583 -903 ) = 76

hence , The eleventh number of the series is 76

#Learn more:

The average of eleven numbers is 60. If the average of first six numbers is 58 and that of the last six numbers is 63 find the sixth number

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