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The new mean would be 7. The mean is the average of the data.

(x1+x2+x3+x4+x5+x6+x7+x8+x9+x10)/10=21

[(x1/3)+(x2/3)+(x3/3)+(x4/3)+(x5/3)+(x6/3)+(x7/3)+(x8/3)+(x9/3)+(x10/3)]/10=?

[(1/3)(x1+x2+x3+x4+x5+x6+x7+x8+x9+x10)]/10=?

[(x1+x2+x3+x4+x5+x6+x7+x8+x9+x10)/10]/3=

21/3=7

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Q: The mean of 10 observations is 21 If each score is divided by 3 find the new mean?
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