If arithmetic mean of 75 numbers is calculated it is 35
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When each number is increased by 5, the mean also get increased by 5 and new mean is 35 + 5 = 40
Lets see how this happens
Total = 75 × 35
When each number is increased by 5, total = 75 × 35 + 75 × 5 = 75 (35 + 5) = 75 × 40
New mean =
75
×
40
75
75×4075 = 40
Lets see how this happens
Total = 75 × 35
When each number is increased by 5, total = 75 × 35 + 75 × 5 = 75 (35 + 5) = 75 × 40
New mean =
75
×
40
75
75×4075 = 40
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