There is a group of 10 numbers, and one of the numbers 21 is mistakenly written as 27 when calculating their average, how much more the calculated average is than the actual average.
有一组数共10个，在计算它们的平均数时误把其中一个数21写成了27，则计算的平均数比实际平均数多多少．
<gadget id="calculator">27 - 21</gadget>
<output>6</output>

<gadget id="calculator">6 / 10</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>