Question
The average of five numbers is 140. If one number is excluded, the average of the remaining four numbers is 130. The excluded number is :
Answer: Option B
Answer: (b)Required number = 5 × 140 – 4 × 130 = 700 – 520 = 180 Aliter : Using Rule 25, Here, x = (140 – 130) = 10, n = 5 Excluded number = Average + x (n – 1) = 140 + 10 × 4 = 180
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Answer: (b)Required number = 5 × 140 – 4 × 130 = 700 – 520 = 180 Aliter : Using Rule 25, Here, x = (140 – 130) = 10, n = 5 Excluded number = Average + x (n – 1) = 140 + 10 × 4 = 180
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