The "73 million and 3" Year-Old Dinosaur Fossil: A Story About Rounding Up Numbers


MoldSense Technical Newsletter
July 23, 2008
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The "73 million and 3" Year-Old Dinosaur Fossil
 
Why Rounding Up Numbers

A guy took his date to a natural history museum and they saw this T-Rex fossil. In an attempt to impress his date, this guy told her that this fossil is 73,000,003 year-old. Being a biology major, she didn't believe that carbon dating can be this exact. Of course, she asked politely that how he knows that. Our guy said with pride that he knows it because that the museum tour guide told him this exact T-Rex fossil was 73,000,000 year-old when he visited the museum 3 years ago.

The rounding rule for significant figure in layman's term is that when we add numbers together, the sum needs to be rounded up to have the same degree of uncertainty as the number that has the largest uncertainty. Otherwise, the precision of the measurement will be misrepresented.
For Example:
73,000,000 + 3 = 73,000,003 -> 73,000,000
73,000,000 + 3,300,000 = 76,300,000 -> 76,000,000

It's the same when adding individual spore concentrations to come up with the total spore concentrations.
For Example:
7,300 Asp/Pen + 13 Stachybotrys = 7,313 -> 7,300
7,300 Asp/Pen + 130 Stachybotrys = 7,430 -> 7,400

In fact, it's in AIHA EMLAP Policy that data need to be rounded up to the proper significant figure to represent the correct precision. If the labs do not round it up after adding the numbers together, the precision is misrepresented. Check your lab reports to see if you need to call your lab and tell them about the story about a "73 million and 3" Year-Old Dinosaur Fossil".


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IAQ Radio Episode 90: Ronald J. Papa, SPPA - President
 
You have been invited to join a live Community Call.

Host: Joe Hughes/Cliff Zlotnik

Ron Papa is President of National Fire Adjustment the largest public adjusting firm in the US and Canada. NFA has served over 40,000 customers and adjusted claims worth hundreds of millions of dollars since being formed in 1922. Ron has been instrumental in NFA's growth over the past 25 years. He has successfully adjusted several thousand insured losses working for a wide range of clients since 1971. Join us Friday at noon to learn more about the service public adjusters offer for business owners and everyday people that are confused, overwhelmed and at the mercy of the insurance companies.

Scheduled Time:
Date: Fri, July 25, 2008
Time: 12:00 PM EDT





We at QLab hope you will find our newsletters an important technical resource to you. If you have suggestions on the topics of our future issues, please feel free to contact us at: info@QLabUSA.com.

Sincerely,


Wei Tang, Ph.D.
Lab Director
QLab
"Quality Laboratory for Quality Professionals"(TM)

Phone: 888-QLab-Wei (888-752-2934)
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