Results 1 to 15 of 15

Math Help - Significant Figure Help:

  1. #1
    Super Member
    Joined
    Oct 2006
    Posts
    679
    Awards
    1

    Significant Figure Help:

    Thank You for the Help!

    -qbkr21

    Follow Math Help Forum on Facebook and Google+

  2. #2
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by qbkr21 View Post
    Thank You for the Help!

    -qbkr21

    the rule is, you can only be as certain as the least accurate info you were given. so the number of significant figures your answer should have is the least number of significant figures of any info you were given. in this case, that's 2, from the 8.3 ft
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Super Member
    Joined
    Oct 2006
    Posts
    679
    Awards
    1

    RE:

    So then what would my answer be 60? Also how does my work look is it correct. I'm still learning.

    Thanks,
    qbk21
    Follow Math Help Forum on Facebook and Google+

  4. #4
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by qbkr21 View Post
    So then what would my answer be 60? Also how does my work look is it correct. I'm still learning.

    Thanks,
    qbk21
    it would be 61, but i haven't checked your work yet...
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Super Member
    Joined
    Oct 2006
    Posts
    679
    Awards
    1
    Quote Originally Posted by Jhevon View Post
    it would be 61, but i haven't checked your work yet...
    If you could double check I sure would appreciate it. Thank you so much.

    qbkr21
    Follow Math Help Forum on Facebook and Google+

  6. #6
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by qbkr21 View Post
    If you could double check I sure would appreciate it. Thank you so much.

    qbkr21
    your work looks ok to me.

    are you sure sig figs are the problem? maybe the program asked for a specific number of decimal places instead, or maybe it is looking for something else even
    Follow Math Help Forum on Facebook and Google+

  7. #7
    Super Member
    Joined
    Oct 2006
    Posts
    679
    Awards
    1
    Quote Originally Posted by Jhevon View Post
    your work looks ok to me.

    are you sure sig figs are the problem? maybe the program asked for a specific number of decimal places instead, or maybe it is looking for something else even
    Let me ask you one other thing in regards to significant figures...

    [1] 320.57 -(3103.5/1.9)

    The correct number of significant figures is 2.

    Step 1 => (3103.5/1.9) = 1633.42105263

    What would be the correct number of figures here?
    Follow Math Help Forum on Facebook and Google+

  8. #8
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by qbkr21 View Post
    Let me ask you one other thing in regards to significant figures...

    [1] 320.57 -(3103.5/1.9)

    The correct number of significant figures is 2.

    Step 1 => (3103.5/1.9) = 1633.42105263

    What would be the correct number of figures here?
    it would be 2 as well, which would require you writing in scientific form, that is, 1.6 \times 10^3

    it may also be the convention to write 1600, check your text to see if this is employed
    Follow Math Help Forum on Facebook and Google+

  9. #9
    Super Member
    Joined
    Oct 2006
    Posts
    679
    Awards
    1
    Quote Originally Posted by Jhevon View Post
    it would be 2 as well, which would require you writing in scientific form, that is, 1.6 \times 10^3
    Ok I think I'm getting the picture

    Thank You
    Follow Math Help Forum on Facebook and Google+

  10. #10
    Super Member
    Joined
    Oct 2006
    Posts
    679
    Awards
    1

    RE:

    Just one other thing.

    Suppose I wanted to convert

    1.50 kg/m3 to g/L

    I did and got 1.5 using only 1 significant figure how would I write this?
    Follow Math Help Forum on Facebook and Google+

  11. #11
    Senior Member Spec's Avatar
    Joined
    Aug 2007
    Posts
    318
    1.50 kg/m^3 is 1.50 g/L

    1.50 with one significant number is 2, but you don't lose any significant numbers in the conversion from kg/m^3 to g/L.

    Maybe you should read this article about significant numbers: http://en.wikipedia.org/wiki/Significant_figures
    Follow Math Help Forum on Facebook and Google+

  12. #12
    Super Member
    Joined
    Oct 2006
    Posts
    679
    Awards
    1

    RE:

    I read the article in it's entirety. I'm just still confused.

    1) 0.050 L to mL

    I converted and found the answer to be 50 ml so I tried writing as 5 x 10^1

    The system said it was wrong

    2) 8.0 x 10^-8 m to nm

    I converted and found the answer to be 80 nm so I tried writing as 8 x 10^1

    The system said it was wrong

    I'm still stuck.

    Thanks,
    qbkr21
    Follow Math Help Forum on Facebook and Google+

  13. #13
    Senior Member Spec's Avatar
    Joined
    Aug 2007
    Posts
    318
    Maybe the system is expecting such an ambiguous answer? Have you tried entering 50 ml instead of 5.0 x 10^1 ml?

    Note the bold text.
    Follow Math Help Forum on Facebook and Google+

  14. #14
    Super Member
    Joined
    Oct 2006
    Posts
    679
    Awards
    1

    RE:

    Quote Originally Posted by Spec View Post
    Maybe the system is expecting such an ambiguous answer? Have you tried entering 50 ml instead of 5.0 x 10^1 ml?

    Note the bold text.
    In subtraction you know how you take the result of the fewest decimal places.

    What if you subtract a number that doesn't a decimal place such as

    320.57-1600
    Follow Math Help Forum on Facebook and Google+

  15. #15
    Senior Member Spec's Avatar
    Joined
    Aug 2007
    Posts
    318
    The problem is that it is a bit ambiguous to write 1600 instead of 16 x 10^2. 1600 can be both 16 x 10^2 and 16.00 x 10^2.

    In the first case you're limited to two significant numbers, and in the latter to four.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Significant Figure
    Posted in the Algebra Forum
    Replies: 2
    Last Post: January 23rd 2011, 03:35 PM
  2. Replies: 3
    Last Post: October 21st 2010, 08:46 AM
  3. Replies: 2
    Last Post: June 4th 2010, 07:02 AM
  4. significant MANOVA, no significant ANOVAs
    Posted in the Advanced Statistics Forum
    Replies: 0
    Last Post: September 21st 2009, 08:50 AM
  5. another significant figure question.
    Posted in the Math Topics Forum
    Replies: 1
    Last Post: September 6th 2008, 04:19 PM

Search Tags


/mathhelpforum @mathhelpforum