Final answer:
The stenographer makes exactly fourteen typographical errors during an hour long court case is false. The stenographer makes no more than five typographical errors during an hour long court case is true. The stenographer makes four or more typographical errors during an hour long court case is also true.
Step-by-step explanation:
(a) To find the average number of typographical errors made by the stenographer during an hour long court case, we can use the concept of average. If the stenographer makes five typographical errors per hour on average, that means they make five typographical errors on average for every hour of work. So, if the court case is one hour long, they would make approximately five typographical errors. Therefore, the statement 'the stenographer makes exactly fourteen typographical errors during an hour long court case' is false.
(b) The statement 'the stenographer makes no more than five typographical errors during an hour long court case' is true if we consider the average. Since the average is five typographical errors per hour, the stenographer can make up to five typographical errors during an hour long court case.
(c) The statement 'the stenographer makes four or more typographical errors during an hour long court case' is true based on the average of five typographical errors per hour. Since four is less than the average, it is possible for the stenographer to make four or more typographical errors during an hour long court case.