$6.)$ Miller Beer needs its beer to be somewhat bitter, bat not toe bitter, in order to maximize sales revense from Wilmouin Brea. The alandard way of measuring bittersess is the number of IBUs or Intersational Bitterness Units. A batch of Oid Milwniter beer has can arerser $24$ IBUts with a standard deviation of $3\mathrm{.}1$ IDUs, moreover IBUs are diatributed sormally arrow beer hablise. If the batch of beer has more than $28$ IDUs Wisconain Bros declare the beer "liberal, coatal elite beer" and reflue to drink it$.$ If the beer has fewer than $18$ IBUs Waconain Bros declare the beer "wenk" and abs reflue to drink it$.$ What is the probability that a rembiomly drawn batch of beer will he undrimkable to Wiscuesis Blow?