SMS per day 

ratio 
1. What is the level of measurement? 

3 

21 
2. Find the sample size n. 

4.5 

3 
3. Find the minimum. 

5 

27 
4. Find the maximum. 

5 

24 
5. Find the range. 

5 

15 
6. Find the midrange. 

5 

5 
7. Find the mode. 

6 

8 
8. Find the median. 

7 

10.93 
9. Find the sample mean x. 

7 

7.56 
10. Find the sample standard deviation sx. 

8 

0.69 
11. Find the sample coefficient of variation CV. 

8 

4 
12. Bin width 

9 


13. Histogram 

10 




10 

Ball bounce bin upper limits (x) 
Frequency F 
Relative Frequency p(x) 
10 

7 
9 
0.43 
10 

11 
7 
0.33 
20 

15 
0 
0 
20 

19 
0 
0 
25 

23 
2 
0.1 
25 

27 
3 
0.14 
27 

Sums: 
21 
1 








14. Sketch a relative frequency histogram of the data 



bimodal 
15. What is the shape of the histogram? 



0.43 
16. p(x ≤ 7) = 



0.095 
17. p(19 < x ≤ 23) = 



50.00% 
18. p(student has cell phone) = 30/60 



More likely 
19. The probability that an FSM resident has a cell phone is estimated at 13% to 19%. 

















