Exerace 5 Let x xq, .x be independent and isedenti cally distributed random variables distributed of Somean land varian (s. We define the empirical variance . g z - 1 5 ( Xi - X)? where I is the empini m - 1 izl cal mean. 1. Show that In is an unbiased estimation of a? by. using the definition. 2 . Show that Sin converges in probability to o