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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 |
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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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