Question

13. The average height of 30 students is 3 feet. If 5
student leave the class their average height becomes
2.8 feet. Find average height of five students.
(a) 5 feet
(b) 4 feet
(c) 3 feet
(d) 3.2 feet​

Answer 1

Answer:

average height of five students is 3.2 feet.

Answer 2

Answer:4feet

Step-by-step explanation:

Average=sum of observations/no of observations

For 30 students

3=x/30=>x=90(sum of students heights for 30 students)

For 25 students(5 students removed)

2.8=x/25

X=70

Then total height of five students

=90-70=20

Average height of 5 students=

20/5=4

Avg height is 4 feet