Question

Average height of a group of 10 students is 160 cm. Three students of heights 140 cm, 142 cm and 155 cm left the group. What will be the new average height of the group.​

Answer 1

Answer:

166.14

Step-by-step explanation:

let the sum of height of all students be x

average height=sum of all students' height/total no. of students

160=x/10

x=160×10=1600

sum of heights who left the group=140+142+155=437

therefore,new sum of heights =1600-437=1163

no. of students who left=3

therefore, new no. of students=10-3=7

new average height=1163/7=166.14

Answer 2

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Let the sum 0f all students height be x

then average:-160

$160=\frac{x}{10}\\</p><p>=>160×10=x \\ x=1600$

Then 3 student who left their height

$=>140+142+155=437$

The height of 7 students=1600-437

=> 1163

And their average=$\frac{1163}{7}=116.4$