The average of 5 data is 9.7, if the first 4 data are 9.7, 9.68, 9.72, 9.65, then what is the fifth data.
5个数据的平均数是9.7，若前4个数据分别是9.7、9.68、9.72、9.65，那么第5个数据是多少．
<gadget id="calculator">9.7 * 5</gadget>
<output>48.5</output>

<gadget id="calculator">9.7 + 9.68 + 9.72 + 9.65</gadget>
<output>38.75</output>

<gadget id="calculator">48.5 - 38.75</gadget>
<output>9.75</output>

<result>9.75</result>