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Help me here. I weight 20 capsules. My weight is 0.976 g… - Melodramatic, corsetted mistress of the obscure
January 30th, 2008
10:59 am

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Help me here.

I weight 20 capsules. My weight is 0.976 g

Therefore, my average weight is 0.0488 g/capsule. I am only allowed those three significant figures, right?


I am to multiply it by 92725

I should write my answer as 4530 not 4525, right?!

(16 comments | Leave a comment)

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[User Picture]
From:affreca
Date:January 30th, 2008 05:15 pm (UTC)
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Yes. Multiplication, like division, keeps the same number of sig figs (according to my physics lab notebook).
[User Picture]
From:affreca
Date:January 30th, 2008 06:57 pm (UTC)
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However, checking the math I get the exact answer of .0488*92725 =4524.98 which rounds down to 4.52 *10^3 (4520).
[User Picture]
From:solan_t
Date:January 30th, 2008 07:28 pm (UTC)
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You have a point. I was working from memory and I think I have the capsule number incorrect. It ended up being 4525.018 or something like that.
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From:oldwolf
Date:January 30th, 2008 06:13 pm (UTC)
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(Using Windows built in calculator) I divided 0.976 by 20 and got 0.0448 0.0488 times 92725 is = 4524.98 or 4525.00 if rounding up.
[User Picture]
From:solan_t
Date:January 30th, 2008 06:17 pm (UTC)
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I see me as having three significant figures in 0.0448 and SIX in 4525.00

Edited at 2008-01-30 06:18 pm (UTC)
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From:oldwolf
Date:January 30th, 2008 06:27 pm (UTC)
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Six?
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From:solan_t
Date:January 30th, 2008 06:44 pm (UTC)
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[User Picture]
From:oldwolf
Date:January 30th, 2008 07:23 pm (UTC)
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Oh, ok. Nah. I'm just using plain old regular math.
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From:solan_t
Date:January 30th, 2008 06:18 pm (UTC)
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I still get 0.0488 by dividing 0.976 by 20, by the way.
[User Picture]
From:oldwolf
Date:January 30th, 2008 06:26 pm (UTC)
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Yes. I just turned the prob around is all.
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From:solan_t
Date:January 30th, 2008 06:46 pm (UTC)
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Ah, so "0.0448" is a typo?
[User Picture]
From:oldwolf
Date:January 30th, 2008 07:26 pm (UTC)
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Umm... I dunno??? It's the number you posted. "0.0488 g/capsule"

Oh wait. Yeah it is. Lemee re-check again.

(We've been dealing with that cable that was cut in Alexandria Egypt.)
[User Picture]
From:oldwolf
Date:January 30th, 2008 06:30 pm (UTC)
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I also divided 4524.98 by 0.0488 and got 101004.01785714285714285714285714. Which rounded up is: 101004.02
[User Picture]
From:solan_t
Date:January 30th, 2008 06:45 pm (UTC)
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I suspect you put some numbers in wrong, then.
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From:oldwolf
Date:January 30th, 2008 07:23 pm (UTC)
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Hmm... lemee re-check.
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From:fairgoldberry
Date:January 30th, 2008 08:56 pm (UTC)
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If you're holding to the rules on significant digits (which I commend you on, as most people just disregard them and suppose greater accuracy than they have...), then the 4530 looks like your answer to me.

Much love,
Rowan
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