Using the following data on the lengths of fish (in cm) caught by local fisherman in one day, complete the questions below. 34, 23, 26, 27, 12, 18, 19, 45, 31, 20, 27, 26, 9, 6, 55, 34, 26, 37, 44, 38, 22, 13, 18, 34, 37, 31

6, 9, 12, 13, 18, 18, 19, 20, 22, 23, 26, 26, 26, 27, 27, 31, 31, 34, 34, 34, 37, 37, 38, 44, 45, 55

Complete the frequency table below, chose an appropriate class interval for your data.

Class interval Midpoint (x) Frequency (f) xf
0 -<10 5 2 10
10 -<20 15 5 75
20 -<30 25 8 200
30 -<40 35 8 280
40 -<50 45 2 90
50 -<60 55 1 55
∑▒f = 26 ∑▒xf = 710

How to find the average fish size using the table?