Question

Find the mean of the following
X f
1 15
2 27
3 8
4 5​

Answer 1

Answer:

mean = (15 + 27 + 8 + 5)/4

= 55/4

= 13.75

Answer 2

Answer:

X f f(X)

1 15 1×15=15

2 27 2×27=54

3 8 3×8=24

4 5 4×5=20

€(f)=55 €f(X)=113

Mean=€f(X)/€f.

=113/55.

=2.1.

I think this is your answer.