The average height of 30 girls out of a class of 40 is 160 cm. and that of the remaining girls is 156 cm. The average height of the whole class is : Choose the correct choice from the following answers:
A) 159  B) 377  C) 888  D) 266  E) 277
Explanation:   159verage height of the whole class =(36×160+10×15640)=159(36×160+10×15640)=159 cms   159nswer:159
<result>A</result>
The average height of 30 girls out of a class of 40 is 160 cm. and that of the remaining girls is 156 cm. The average height of the whole class is :