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**Unformatted text preview: **, not minus here typo: should be equal, not minus here typo: no square here typo: need a square here • Adding a constant is like shi;ing everything over. – The “spread” stays the same, but – The center moves over. • MulBplying by a constant is like stretching everything out. – If the center is not zero, it gets stretched. – And the deviaBons get stretched, too. • (So the squared deviaBon is stretched by the square!) The average is shi;ed by a. And if the center is not zero, it is stretched by b. The variance is unchanged by a. But it is stretched by the square of b. PercenBles • The 50th percenBle is the median • 20% of the data are below the 20th percenBle • 90% of the data are below the 90th percenBle • ...

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