Standard Deviation Concrete Testing Problem

[thechosenone]

Hi

I came across somewhere a problem which was something like this:

Concrete test results were given,

and it was asking about standard deviation or number of samples etc

Basically concrete testing and Statistics problem...

I am looking for similar practice problem...Anybody can share or make one up or something....

If you came across it and you know what book it was let me know....or share a snapshot with solution....

 

[ptatohed]

I remember something similar when studying for CA Survey - the std dev would need to be calculated for several measurements taken of the same line, for error analysis. My advice is to use your calculator’s std dev function, don’t do it by hand!

 

[John QPE]

I am looking for similar practice problem...Anybody can share or make one up or something....

If you came across it and you know what book it was let me know....or share a snapshot with solution....

In a ready-mix plant, cylinder samples are prepared and tested. The minimum target value was 4000 psi. The following data was collected, determine mean, standard deviation, and coefficient of variation for the data.

1. 4914 (psi)
   
2. 4732
   
3. 5670
   
4. 4310
   
5. 6110
   
6. 4316
   
7. 5240
   
8. 4950
   
9. 5230
   
10. 4190
    
11. 5770
    
12. 4524
    
13. 4056
    
14. 5772
    
15. 4270
    
16. 5096
    
17. 4670
    
18. 5174
    
19. 5434
    
20. 3692
    
21. 4510
    
22. 3680
    
23. 4100
    
24. 3680
    
25. 3910
    

 

[SF_century]

The cerm supplemental problems has a section on this. Take a look at that if you want more questions on this topic.