Hi can someone explain why E(X) is 2 here? The answers at the back say its 2 because its symmetrical but I dont understand?
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jessyjellytot14
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- 25-02-2016 18:25
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- 25-02-2016 18:37
(Original post by jessyjellytot14)
Hi can someone explain why E(X) is 2 here? The answers at the back say its 2 because its symmetrical but I dont understand?
Posted from TSR MobileBut another way to see it is:
But you know that probabilities sum to one, so:, back-subbing:
.
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- 25-02-2016 18:53
(Original post by Zacken)
Well, it's because symmetry.But another way to see it is:
But you know that probabilities sum to one, so:, back-subbing:
.
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- 25-02-2016 18:55
(Original post by aymanzayedmannan)
no full solutions!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!! -
tiny hobbit
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- 25-02-2016 20:37
(Original post by jessyjellytot14)
Hi can someone explain why E(X) is 2 here? The answers at the back say its 2 because its symmetrical but I dont understand?
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