Question

the average height of 30 students is 150cm. 6 new students increase the height to 155cm. determine the average height of 6 new students

Answer 1

Answer:

Step-by-step explanation:

Average height of 30 students is 150 cm

So total height of 30 students is 30x150=4500

Similarly total height of 36 students is 36x155=5580

So total height of 6 new students=5580-4500=1080

Average of these six students = 1080/6

=180

Answer 2

Answer:

Step-by-step explanation:

Let the height of 30 students be x1,x2........x30.

Avg= (x1+x2.........x30)/30

150= (x1+x2..........x30)/30

150*30=(x1+x2.........x30)

4500= (x1+x2..........x30) ...eq(1)

Acc. To ques. 6 new students added

Now,155=(x1+x2+......x36)/36

155*36=(x1+x2+........x36)

5580=(x1+x2..........x36) ..eq(2)

eq(2)-eq(1)

5580-4500=(x1+x2.......x6)

For avg. Height of 6 students

1080/6=(x1+x2........x6)/6

180=(x1+x2..........x6)/6. Ans: avg.Height of 6 students is 180 cm