Question 1200282
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A sample of n = 10 scores has a mean of M = 7. One score in sample is changed 
from X = 21 to X = 11. What is the value of the new sample mean?
The new sample mean is
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The sum of scores of the original sample is 7*10 = 70.


After the change, the sum of scores of the updated sample is 70 - 21 + 11 = 60.


New sample mean is  {{{60/10}}} = 6.    <U>ANSWER</U>
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Solved.