Find the average of first 10 multiples of 71. 35.52. 37.53. 38.54. 40.

1.	Find the average of first 10 multiples of 71. 35.52. 37.53. 38.54. 40.5
Answer» Correct Answer - Option 3 : 38.5 Given: First 10 multiples of 7 Formula used: Average = a × (n + 1)/2 Where, ‘a’ denotes the first number and ‘n’ denotes number of terms Calculation: Average = 7 × (10 + 1)/2 ⇒ 7 × 11/2 = 38.5 ∴ The average of the first 10 multiples of is 38.5 Alternate method: Among 10 terms, the middle term will be the average of 5^th term and 6^th term and it will be the average of the whole series. The 5^th term is 7 × 5 = 35 The 6^th term is 7 × 6 = 42 Average of 5^th and 6^th term = (35 + 42)/2 = 38.5 ∴ The average of the first 10 multiples of 7 is 38.5

Find the average of first 10 multiples of 71. 35.52. 37.53. 38.54. 40.5

Answer» Correct Answer - Option 3 : 38.5

Given:

First 10 multiples of 7

Formula used:

Average = a × (n + 1)/2

Where, ‘a’ denotes the first number and ‘n’ denotes number of terms

Calculation:

Average = 7 × (10 + 1)/2

⇒ 7 × 11/2 = 38.5

∴ The average of the first 10 multiples of is 38.5

Alternate method:

Among 10 terms, the middle term will be the average of 5^th term and 6^th term and it will be the average of the whole series.

The 5^th term is 7 × 5 = 35

The 6^th term is 7 × 6 = 42

Average of 5^th and 6^th term = (35 + 42)/2 = 38.5

∴ The average of the first 10 multiples of 7 is 38.5

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