Question

find the arithmetic mean xi 2 6 7 8 9 3 fi 5 4 8 6 4 2​

Answer 1

xi fi xifi

2 5 10

6 4 24

7 8 56

8 6 48

9 4 36

3 2 6

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29 180

arthematic mean = sum of xifi

-------------

fi

= 180

29

= 6.206