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The mean of $x$ ₁, $x$ ₂, $x$ ₃, $x$ ₄, $x$ ₅ is 12. What is the mean of $x$ ₁ + 4, $x$ ₂ + 8, $x$ ₃ + 12, $x$ ₄ + 16, $x$ ₅ + 20?

Competition practiceStatistics

A32
B72
C24
D16

Step-by-Step Solution

Extra added

= 4 + 8 + 12 + 16 + 20 = 60

, so the mean rises by

\frac{60}{5} = 12

: new mean 24.

Answer: C) 24

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