Hi, I am trying to understand how to interpret a problem that uses the expectation operator. Please see the attached pdf for more information.

Could someone explain in words how to read the definition of Yk that uses the summation operator?

Why would the mean of Y equal 0? I think I am misinterpreting the subscripts of X because if subtract 0 to 3 from k, to me that would shift the mean to a negative time index. Why is that 0?

In part b, I'm not even really sure where to start. Both of these questions seem relatively simple. I think my biggest hurdle is just knowing how to properly read this notation and the subscripts. Any resources would be greatly appreciated.

Thank you.

Also, if anyone knows how to insert equations directly into a post, please let me know. I would much rather do that and avoid using an attachment.

Could someone explain in words how to read the definition of Yk that uses the summation operator?

Why would the mean of Y equal 0? I think I am misinterpreting the subscripts of X because if subtract 0 to 3 from k, to me that would shift the mean to a negative time index. Why is that 0?

In part b, I'm not even really sure where to start. Both of these questions seem relatively simple. I think my biggest hurdle is just knowing how to properly read this notation and the subscripts. Any resources would be greatly appreciated.

Thank you.

Also, if anyone knows how to insert equations directly into a post, please let me know. I would much rather do that and avoid using an attachment.

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