Question

If E(X) 15, P(X 11) 0.2, and P(X 19) 0.3, which of the following is impossible? O Var(X) < 7 o Var(X) < 8 O Var(X) > 8 Var(X)>7

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Answer #1

TOPIC: Use of Chebychev's inequality to find the required bound on the variance of X.

then, we got Comparing 0) and ;1, σ be the variane of the given oandom variable x tnen, we musk havc 3 0.5 2 2. 으고. >,0.5 2、グ 2. So, unden condition we have→ option-③is tnue, as, van (x)>+, can happen pion- is aho tnue, as, v (x8, can happen, anly when, var () cant happen, o, cooaert anaw en, which io imomi ble

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