# Equation

How many real roots have equation

${x}^{3}=x$

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**Math student**

The annual salary of an entry level statistics major (in thousands of dollars) is normally distributed with mean of 75 and standard deviation of 12 X ∼ N ( μ = 75 , σ = 12 ). What is the minimum salary a statistics major should aim for in order to earn amongst the top 10%?

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