This Blog exists for the collective benefit of all algebra students. While the posts are specific to Mr. Chamberlain's class, any and all "algebra-ticians" are welcome. The more specific your question (including your own attempts to answer it) the better.
I understand that there has been a discussion surrounding #21 on page 147. The issue at hand is a concept called MEASUREMENT ERROR.
Consider a digital bathroom scale that displays ACCURATE answers in pounds. What are the minimum and maximum weights for a person that displays a weight of 147 on the scale?
Well.... -If someone weighs 147.1 lbs, their weight will be displayed as 147 -If someone weighs 147.4 lbs, their weight will be displayed as 147 -If someone weighs 146.6 lbs, their weight will be displayed as 147 -If someone weighs 146.3 lbs, their weight will be displayed as 146
Therefore, the minimum and maximum actual weights refer to the unit of measure involved. Since the scale measures to the nearest pound, it is possible for someone to weight 1/2 higher or lower and still display the "central" weight of 147. According to the text book, the min weight is 146.5 and the max is 147.5.
I disagree with the text, in that many rounding methods ALWAYS "round up" so that the range of potential weights would be 146.5 to 147.4 (since 147.5 would round up top 148). This is a very small "bone of contention" and I would accept either answer on a test.
hi! well I'm having trouble on numbers 31 and 33. I don't understand how to fine the minimum and maximum of the numbers! it all confuses me! Could someone help me understand?
I understand that there has been a discussion surrounding #21 on page 147. The issue at hand is a concept called MEASUREMENT ERROR.
ReplyDeleteConsider a digital bathroom scale that displays ACCURATE answers in pounds. What are the minimum and maximum weights for a person that displays a weight of 147 on the scale?
Well....
-If someone weighs 147.1 lbs, their weight will be displayed as 147
-If someone weighs 147.4 lbs, their weight will be displayed as 147
-If someone weighs 146.6 lbs, their weight will be displayed as 147
-If someone weighs 146.3 lbs, their weight will be displayed as 146
Therefore, the minimum and maximum actual weights refer to the unit of measure involved. Since the scale measures to the nearest pound, it is possible for someone to weight 1/2 higher or lower and still display the "central" weight of 147. According to the text book, the min weight is 146.5 and the max is 147.5.
I disagree with the text, in that many rounding methods ALWAYS "round up" so that the range of potential weights would be 146.5 to 147.4 (since 147.5 would round up top 148). This is a very small "bone of contention" and I would accept either answer on a test.
Please lmk if this helped anyone...
hi! well I'm having trouble on numbers 31 and 33. I don't understand how to fine the minimum and maximum of the numbers! it all confuses me! Could someone help me understand?
ReplyDelete