A class of 40 students has an average height of 120 cm. four students whose average height is 160 cm, left the class and four others whose average height is 124 cm, joined. Calculate the new average height of the students of the class (in cm) is?
Select
A) 292.4 cm  B) 296.4 cm  C) 206.4 cm  D) 294.4 cm  E) 236.4 cm
Total height = 120 * 40= 
<gadget id="calculator">120 * 40</gadget>
<output>4_800</output>
4800 cm.   Total height of those who left= 160 * 4= 
<gadget id="calculator">160 * 4</gadget>
<output>640</output>
640   Total height of those who joined= 124 * 4= 
<gadget id="calculator">124 * 4</gadget>
<output>496</output>
496   New average= [12000 - 640 + 496 ] / 40 = 11856/40 cm.   = 296.4 cm   Answer:296.4 cm
<result>B</result>
A class of 40 students has an average height of 120 cm. four students whose average height is 160 cm, left the class and four others whose average height is 124 cm, joined. Calculate the new average height of the students of the class (in cm) is?