Question: Every Normal model is defined by its parameters, the mean and the standard deviation. For each model described here, find the missing parameter. As always,

Every Normal model is defined by its parameters, the mean and the standard deviation. For each model described here, find the missing parameter. As always, start by drawing a picture.
a) μ = 20, 45% above 30; σ ?
b) μ = 88, 2% below 50; σ ?
c) σ = 5, 80% below 100; μ = ?
d) σ = 15.6, 10% above 17.2; μ = ?

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