I need a detailed answer if possible Consider the procedure

I need a detailed answer if possible.

Consider the procedure described in “Adaptive Playout Delay” for estimating average delay d_i. Let r₃ -t₃ be the most recent sample delay, let r₂ -t₂ be the next most recent sample delay, and so on. For a given audio application, suppose three packets have arrived at the receiver with sample delays r₁ -t₁, r₂ -t_2, and r₃ -t₃. Express the estimate of delay d in terms of u and the three samples.

Solution