There are 6 students who have a physical examination, and the heights of the 3 students are 143 cm, 154 cm, and 144 cm respectively; the height of the other 3 students are all 143 cm. What is their average height in centimeters?
有6位同学体检，3位同学的身高分别为143厘米、154厘米、144厘米；其他3位同学的身高都是143厘米．他们的平均身高是多少厘米？
<gadget id="calculator">143 * 3</gadget>
<output>429</output>

<gadget id="calculator">143 + 154 + 144 + 429</gadget>
<output>870</output>

<gadget id="calculator">870 / 6</gadget>
<output>145</output>

<result>145</result>