Suppose that two raters are judging each ofnitems.Each rater assigns a pass or fail to each item. Their ratings across items areindependent. On each item, the raters can agree positively (both pass theitem), agree negatively (both fail the item), or disagree (one passes the itemand the other fails the item). A possible model for the outcome of each itemis the following:both pass: with probability (1 +)/4;disagree: with probability (1-)/2;both fail: with probability (1 +)/4;where(-1,1) is an unknown parameter.(a) Suppose the two raters agree positively onXitems, disagree onX12items, and agree negatively onXitems. Write down the exact likelihood3for thenitems being rated, where