Please help me with solving the below.

State some clear assumptions. thanks a lot

A friend of yours is interested in estimating an univariate model of the form #1 = (3931' + \"is where the explanatory variable a: and error term 1: are independent of each other. However, he realizes that the explanatory variable a: is very difcult to measure. He only manages to gather data on the mismeasured variable 9:\