Question

1. Solve the following:
1. The following table shows the number of saplings planted by 20 students.
Fill in the boxes and find the average number of saplings planted by
each students
(3 m)
Number of saplings No of students fixx
Meanx=
N
(Scores)
(frequency) fi
1
8
5
2
6
3
1
..The Average
number of trees
0
4
N=
fix planted
= 0
(2 m)
2. Decide whether given values are the solutions of given equation.
2a + 4 = 0, a= 2,-2​

Answer 1

Answer:

SOLUTION

No. of saplings

(Scores) xi No. of students

(frequncy) fi fi×xi

1 4 4

2 6 = 2 x 6 = 12

3 12 = 3 x 12 = 36

4 8 = 4 x 8 = 32

N = 30 ∑fixi= 84

Mean

x¯ =

∑fixxN

=

8430

= 2.8

∴ The average number of trees planted 2.8