9. Find the mean of the following data : Х
8
10
12
20
16
F
2
3
7
2
5

Step-by-step explanation:

( See the attached picture )

Now,

Mean =

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In the case of repeated data , follow the steps given below to calculate the mean :

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x = 23.78

step-by-step explanation:

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)