1.

The average of 13 number is 48.5. The average of the first five numbers is 56.4 and that of the last nine numbers is 45.6. What is the 5th number?1.    61.72.    51.93.    61.94.    60.7

Answer» Correct Answer - Option 3 :    61.9

Given:

Total sum of 13 numbers = 13 × 48.5 = 630.5

Formula:

Average = Sum of numbers/Total numbers

Calculation:

Total sum of first 5 numbers = 5 × 56.4 = 282

Total sum of last 9 numbers = 9 × 45.6 = 410.4

∴ 5th number = (282 + 410.4) - 630.5 = 61.9



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