Statistics and Probability Dictionary

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E Notation

E notation is a way to write numbers that are too large or too small to be concisely written in a decimal format.

With E notation, the letter E represents "times ten raised to the power of". Here are some examples of numbers written using E notation:

3.02E12 = 3.02 * 1012 = 3,020,000,000,000

9.236E-19 = 9.236 * 10-19 = 0.0000000000000000009236

All of the calculators on the Stat Trek web site use E notation when numbers are extremely small. For example, the probability that thirty consecutive coin flips will all land on Heads is 0.000000000000000888178419700125, which is extremely small. The Binomial Calculator uses E notation to express this probability as 8.88178419700125E-16.