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In America it is math, in most European countries it is maths
169 cm is about 5′ 6½″, which is a fairly average height for an adult woman in most countries, but shorter than average adult male height in most countries.
In the short scale, which is used by most countries, 13 zeros.
There are two standard measurement units that are used across the world. Most countries either implore that metric system or what is called the US System.
a small mean difference and large sample variances