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Rounding

JNichols
New Contributor I
412 Views

My daughter in the 8th grade came home with homework on averages for speed.

 

Distance Time V
2 9 0.222222
2 13 0.153846
2 11 0.181818
     
  mean 0.185962
  stdev 0.034376

 

The closest answer was 0.18 m/s.  It made me think of the stuff we were talking about the other day about rounding.  I chuckled and thought of you lot. 

Clearly you tell your 13 yr old daughter the answer is 0.18, and you 

1.  do not raise an issue with the teacher as she is doing metric problems

2. raise the issue with the teacher as a concerned engineer that answers need to be accurate.  

If you answered 2 - interesting, but it is the wrong answer as it will not win you any friends and may alienate your daughter's teacher.  

Rounding obeys higher rules than set out in the manuals. 

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4 Replies
andrew_4619
Honored Contributor II
368 Views

But the  answer is maybe 0.181818 as 6 units of distance were complete in 33 units of time.....?

JohnNichols
Valued Contributor II
301 Views

Yes that is the way my daughter was taught.   

Interesting actually - just from a pedagogical viewpoint. 

I was happy she was being taught metric in Texas. 

jimdempseyatthecove
Black Belt
230 Views

>>The closest answer was 0.18 m/s. 

The chart does not indicate the units of measure. So the answer would be .18(.1818...) unit velocities.

Jim Dempsey

JohnNichols
Valued Contributor II
227 Views

My apologies, it is an 8th grade math problem - they are just learning about length and time to get velocity.  

It is interesting to read the problems. sometimes you can know to much.  

ie, what is the bottom of the theoretical physics well?  

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