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--- b:head_first_statistics:using_discrete_probability_distributions [2024/10/01 21:39] – [Fat Dan changed his prices] hkimscil
+++ b:head_first_statistics:using_discrete_probability_distributions [2024/10/01 21:44] (current) – [Fat Dan changed his prices] hkimscil
@@ Line 306: / Line 306: @@
 & = & E(5X) + 3 \\
 & = & 5 E(X) + 3 \\
-& = & -0.85
+& = & -0.85 \\
+\\
+\\
+Var(Y) & = & Var(5X+3) \\
+& = & Var(5X) + Var(3) \\
+& = & Var(5X) \\
+& = & 5^2 Var(X) \\
+& = & 67.4275
 \end{eqnarray*}
-$ 5 * Var(X) = 13.4855 $
-$ 5^2 * Var(X) = 67.4275 $
-$ Var(Y) = 5^2 * Var(X) $
 \begin{eqnarray*}