Question

Answer the following questions in about twelve sentences (each question carries 4 marks)
Calculate the arithmetic mean from the following data.
X 5 10 15 20 25 30 35 40
F 57 9 10 8 6 5 2
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Answer 1

Hey mate ..

here is your answer...

(As there is no any specific method is given , I'm solving it with the help of direct method )

X. F. FX.

5 5 25

10 7 70

15 9 135

20 10 200

25 8 200

30 6 180

35 5 175

40 2 80

now ,

mean = sigma FX / sigma F

=1065/52

=20.5 ans.

(here I am also giving all formulas of finding mean in picture)

★hope it will be helpful for you ☺️★