Math Professor Says Coin Flips Not Really 50/50

Photo (cc) by JaseCurtis

The Smithsonian reports…

Diaconis is a professor of mathematics and statistics at Stanford University and, formerly, a professional magician. While his claim to fame is determining how many times a deck of cards must be shuffled in order to give a mathematically random result (it’s either five or seven, depending on your criteria), he’s also dabbled in the world of coin games. What he and his fellow researchers discovered (here’s a PDF of their paper) is that most games of chance involving coins aren’t as even as you’d think. For example, even the 50/50 coin toss really isn’t 50/50 — it’s closer to 51/49, biased toward whatever side was up when the coin was thrown into the air.

But more incredibly, as reported by Science News, spinning a penny, in this case one with the Lincoln Memorial on the back, gives even more pronounced odds — the penny will land tails side up roughly 80 percent of the time.

So next time you have to settle something with a coin toss, offer to do a coin spin. (Now that you know how to win most of the time.)

Disclosure: The information you read here is always objective. However, we sometimes receive compensation when you click links within our stories.

Read Next
5 Ways Retirees Can Lower Their Income Taxes
5 Ways Retirees Can Lower Their Income Taxes

Here’s how to keep Uncle Sam’s mitts away from your nest egg.

Prepare to Pay More for These 31 Drugs in 2021
Prepare to Pay More for These 31 Drugs in 2021

More than 700 prescription medications have seen price hikes so far this year. Here’s a look at the worst.

Marooned at Home? Earn Some Cash Playing on Your Computer
Marooned at Home? Earn Some Cash Playing on Your Computer

Earn cash by reading emails, taking surveys, playing games, shopping and signing up for offers through this website.

Secret Ways to Save on Netflix
Secret Ways to Save on Netflix

These little-known savings tactics can help whittle down what you pay for your streaming video subscription — every month.

What Brand Makes the Best Rechargeable AA Batteries?
What Brand Makes the Best Rechargeable AA Batteries?

The best battery depends on what you need it for and how big your budget is. Here’s how to find the cheapest brand that will do the job you need.

View this page without ads

Help us produce more money-saving articles and videos by subscribing to a membership.

Get Started

Most Popular
7 Kirkland Signature Items to Avoid at Costco
7 Kirkland Signature Items to Avoid at Costco

Even if it seems you save a bundle buying Costco’s Kirkland Signature brand products, they may not be the bargain they appear to be.

Am I Eligible for My Mother’s Social Security Benefit?
Am I Eligible for My Mother’s Social Security Benefit?

Can an adult daughter tap into her late mother’s benefit?

9 Things You’ll Never See at Costco Again
9 Things You’ll Never See at Costco Again

The warehouse store offers an enormous selection, but these products aren’t coming back.

3 Ways to Get Microsoft Office for Free
3 Ways to Get Microsoft Office for Free

With a little ingenuity, you can cut Office costs to zero.

This Surprise Factor Can Raise Your Risk of Dementia
This Surprise Factor Can Raise Your Risk of Dementia

Nearly half of U.S. residents may face this threat.

Organize Your Home With These 10 Thrift Store Finds
Organize Your Home With These 10 Thrift Store Finds

Resolve to be clutter-free in 2021 with these secondhand purchases.

11 Laws You Could Be Breaking Without Knowing It
11 Laws You Could Be Breaking Without Knowing It

Seriously? Fibbing about the weather is a crime? This and other little-known legal traps await the unwary.

Is This Treatable Condition Causing Your High Blood Pressure?
Is This Treatable Condition Causing Your High Blood Pressure?

Researchers say too many doctors are overlooking this potential source of hypertension.

13 Things Seniors Can Get for Free — or Almost Free
13 Things Seniors Can Get for Free — or Almost Free

There are many ways to get cheap or free services and goods after reaching a certain age.

These Are the 3 Best Used Cars You Can Buy
These Are the 3 Best Used Cars You Can Buy

These vehicles boast reliability, safety and long-lasting value.

21 Items to Cut From Your Budget That You Won’t Even Miss
21 Items to Cut From Your Budget That You Won’t Even Miss

Start off the new year by implementing these small-but-smart savings strategies. They’ll soon add up.

Internet Providers Can’t Charge You for This Anymore
Internet Providers Can’t Charge You for This Anymore

Starting this month, your ISP no longer can bill you for this fee.

Taking a Multivitamin? Here’s Why You Should Reconsider
Taking a Multivitamin? Here’s Why You Should Reconsider

A new study has bad news for the millions of Americans who spend money on multivitamins.

15 Painless Ways You Can Cut Costs in 2021
15 Painless Ways You Can Cut Costs in 2021

Follow these tips to save, so you’ll have money for things that really matter.

9 Small Expenses That Are Bleeding Your Budget Dry
9 Small Expenses That Are Bleeding Your Budget Dry

Keep more of future paychecks by eliminating these budget-busting unnecessary expenses.

11 Huge Retirement Costs That Are Often Overlooked
11 Huge Retirement Costs That Are Often Overlooked

Does your retirement budget account for all of these costs?

7 Tricks to Cleaning Your Bathroom Faster
7 Tricks to Cleaning Your Bathroom Faster

These tips can get your bathroom sparkling with little time and no elbow grease.

20 Amazon Purchases We Loved in 2020
20 Amazon Purchases We Loved in 2020

These practical products made everyday life a little easier last year — and will do so in the new year, too.

10 Times You’re Right to Be a Cheapskate
10 Times You’re Right to Be a Cheapskate

Clever shoppers can save money without sacrificing quality. Here is how to do it.

View More Articles

View this page without ads

Help us produce more money-saving articles and videos by subscribing to a membership.

Get Started

Add a Comment

Our Policy: We welcome relevant and respectful comments in order to foster healthy and informative discussions. All other comments may be removed. Comments with links are automatically held for moderation.