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What is μ ?

What is the percentage of data within 6 standard deviation (σ) of the mean (μ) : μ ± 6 x σ ?

The parameters μ and σ completely charaterize the normal distribution.

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Normal law is bimodal

What is the percentage of data within 3 standard deviation (σ) of the mean (μ) : μ ± 3 x σ ?

The normal curve is symmetric about its mean.

The parameter "standard deviation" completely charaterize the normal distribution.

The normal curve is not symmetric about its mean.