Question

please do it.....
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Answer 1

.....ANSWER IS 8.1....

......EXPALINATION. IN THE ATTACHED PHOTO. ....

,,,,,,HOPE IT WILL HELP. ...

Answer 2

Answer

xi fi xifi

1 1 1

3 2 6

5 1 5

7 5 35

9 6 54

11 2 22

13 3 39

Sum 20 162

Mean = $\tt{\frac{\Sigma x_{i}f_{i}}{\Sigma f_{i}}}$

= 162/20

= 8.1