id like to post here my problems and see whether im getting counfused or theres

Question

id like to post here my problems and see whether im getting counfused or theres an error (bet on first one..)

Thgre a r.v. with mean and variance . Using the Tchebyschev inequality I should determine an inferior limit to the following prob:



here is the Tchebyschev inequality:

Applying that i obtain: =

I tought i would have got .

id like to post here my problems and see whether im getting counfused or theres an error (bet on first one..) Thgre a r.v. with mean and variance . Using the Tchebyschev inequality I should determine an inferior limit to the following prob: here is the Tchebyschev inequality: Applying that i obtain: = I tought i would have got

Explanation / Answer

actually the one i posted up (and i post her again) is the results disclosed by the book ( not mine):
=

Moreover following its resolution they say

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