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Q.

Find the mean of the following data:


Question Image

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a

21

b

19

c

25

d

31 

answer is C.

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Detailed Solution

The given data is:
Question ImageWe need to find its mean.
We can write the frequency distribution table for the given data as:
Question ImageWe know that,
Mean=ΣfxΣf
⇒Mean=2650106
⇒Mean=25
Therefore, the mean of the given data is 25.
Hence, the correct option is 3.
 
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