1.

The average of 11 numbers is 28. If the average of first 5 numbers is 23 and the average of next 5 numbers is 25, then find the 11th number.1. 682. 583. 734. 63

Answer» Correct Answer - Option 1 : 68

Given:

Average of 11 numbers = 28

Average of first 5 numbers = 23

Average of next 5 numbers = 25

Formula used:

Sum of observations = Average × Number of observations

Calculation:

Sum of 11 numbers = 28 × 11

⇒ 308

Sum of first 5 numbers = 23 × 5

⇒ 115

Sum of next 5 numbers = 25 × 5

⇒ 125

Total sum of first 10 numbers = (115 + 125)

⇒ 240

11th number = (308 – 240)

⇒ 68

∴ The 11th number is 68



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