Average of 40 numbers is 71. If the number 100 replaced by 140, then average is increased by:

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Average of 40 numbers is 71. If the number 100 replaced by 140, then average is increased by:

Answer:

D. 1

Read Explanation:

Sum of 40 numbers = 40 × 71 = 2840 New sum of 40 numbers = 2840 – 100 + 140 = 2880 New average of 40 numbers = 2880/40 = 72 The average increased = 72 – 71 = 1

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