The reason is that in a group, individual errors on either side of the true figure cancel each other out.
cancel error figure
Michael Shermer
These are some quotes by No-nationality author Michael Shermer Writer, who was born on September 8, 1954.
Quotes by Michael Shermer
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When I start getting embroiled in heated debates and feeling stressed, I just turn everything off and disconnect from the world. I simply tell my colleagues and friends that I am not well and need to cancel all meetings for a day or more. I take it easy - go for a long hike, take a vacation somewhere, or just stay at home and read.