One student from a music class is randomly selected on the first day of class. There is an 80% chance that the student arrived on time, and a 20% chance that the student arrived on time and is a female student.

What is the probability that the chosen student is a male student, given that the student arrived at class on time?

Write the probability as a percent. Round to the nearest tenth if needed.

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Ответ:

keirarae2005

15.09.2020

Mathematics

By definition, $\cosh (x) = \dfrac{e^x + e^{-x}}{2}$ so then $\begin{aligned} \cosh (-x ) & = \dfrac{e^{-x} + e^{)}}{2} \\ & = \dfrac{e^{-x} + e^{x} }{2} \\ & = \dfrac{e^{x} + e^{-x} }{2} \\ & = \cosh x \end{aligned}$ via commutative property of addition, order of terms in a sum does not matter.

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