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Calculate the mean

How do you calculate the mean of this:

The table gives the number of words in each sentence of a page:

of wordsi frequency(f) I midpoint(x) I f times x I

—I—I—I—I

1-5               I    6                       I         3                I      18

—I—I—I—

6-10             I    5                       I          8              I       40

—I—I—I—

11-15           I     4                      I                          I

—I—I—I—

16-20           I      2                     I                          I

—I—I—I—

 21-25          I      3                     I                           I

—I—I—I— Totals: I 20 I I

This is all what is given. The question is; Work out an estimate for the mean number of words in a sentence

Please help me :s im clueless

Thanks a lot

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Answer #1

To calculate the mean average, just add up all the items, and divide by the number of items.

Answer #2

okay I am confused with all of the l’s but how you would calculate that is taking all the numbers adding them together and dividing by the total amount there is so how I see it you take 1+5+6+3+18+6+10+5+8+40+11+15+4+16+20+2+21+25+3 what ever that equals and then divid it by 19 now with 1-5, 6-10,11-15,16-20,21-25 if you mean a subtraction sign by that then you just subtract the 5, 10, 15, 20, and 25 instead

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