The arthmetic mean of 9 observation is 7. If each observation is double. find the new mean
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Answer:
14
Step-by-step explanation:
Let's assume that each observation is donated by x₁, x₂, x₃ ... x₉.
original mean = x₁ + x₂ + x₃ ... + x₉./9 = 7 .......................................... (i)
New mean = 2*x₁ +2* x₂ + 2*x₃ ... + 2*x₉./9
= 2*(x₁ + x₂ + x₃ ... + x₉./9) [Taking 2 common]
= 14 [from (i)]
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