fish length/cm 

22 
26 
27 
28 
24 
24 
24 
29 
30 
31 
26 
27 
21 
27 
29 






29 






25 






27 






23 






30 




















Ratio 
1. What is the level of measurement? 





20 
2. Find the sample size n. 





21 
3. Find the minimum. 





31 
4. Find the maximum. 





10 
5. Find the range. 





27 
6. Find the mode. 





27 
7. Find the median. 





26.45 
8. Find the sample mean x. 





26 
9. Find the midrange. 





2.82 
10. Find the sample standard deviation sx. 





0.11 
11. Find the sample coefficient of variation CV. 





2 
12. five bins, what is the width of a single bin? 






13. Determine the frequency and calculate the relative frequency 





Bin upper limits 
Frequency F 
Relative Frequency 




23 
3 
0.15 




25 
4 
0.2 




27 
6 
0.3 




29 
4 
0.2 




31 
3 
0.15 




Sums: 
20 
1 





14. Sketch a frequency histogram of the data, 





Symmetric 
15. What is the shape of the histogram? 





1.97 
16. z = zscore for a Cephalopholis argus that is 32 cm long. 





Ordinary 
17. ordinary length or an unusual length for this fish in the markets of Pohnpei? 






18. What does this suggest about the condition of this fishery? 




