What is the formula for margin of error?

Margin of error is a term used in Statistics to find the confidence interval. It is denoted by E.

Formula for E is:

Critical Value x Standard Deviation / (Square Root of Sample Size)



The critical value is determined by the type of test that is to be used for the given scenario and the confidence level. 

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Planet earth has a mass of 5.9726x10²⁴ kg.then: 5.9726x10²⁴ kg=100% of the total earth mass.if the water´s mass=5x10-4 % of the total mass, we can solve this problem by the rule of three.5.9726x10²⁴ %*10⁻⁴ %x=(5.9726x10²³ kg)(5*10⁻⁴  %) / 100 %=2.9863x10¹⁹ kganswer:   the mass of the planet´s water would be   2.9863 x 10¹⁹ kg.