The fracture strength of tempered glass averages 20 (measured in thousands of pounds per square inch) and has a standard deviation 5. (a) What is the probability that the average fracture strength of 100 randomly selected pieces of this glass exceeds 20.8? [3 points] (b) Find a two sided interval that includes, with probability 0.98, the average fracture strength of 100 randomly selected pieces of this glass. [6 points] (0) What is the probability that the average fracture strength of 100 randomly selected pieces of this glass below 19.4? [3 points] (01) What is the probability that the average fracture strength of 100 randomly selected pieces of this glass between 18.1 and 20.6? [3 points]