Hi i am new to statistics and have the following table

Class Interval Mid-value Frequency Mid-value X

(No of Letters) Frequency

1-3 2 57 114

4-6 5 46 230

7-9 8 28 224

10-12 11 6 66

13-15 14 3 42

I have three questions I need to get, I have got question 1 i think, but am not sure how to work out the rest.

Can anyone help please.

i) Which is the modal class interval? = 57

ii) In which class interval does the median lie?

iii) Calculate the mean word length.

Thanks