The heights of 4 students are 145 cm, 146 cm, 142 cm, and 147 cm respectively. What is their average height?
4个同学身高分别是145厘米、146厘米、142厘米、147厘米，他们的平均身高是多少．
<gadget id="calculator">145 + 146 + 142 + 147</gadget>
<output>580</output>

<gadget id="calculator">580 / 4</gadget>
<output>145</output>

<result>145</result>