Araceli recently competed in a 10K race that had a mean finish time of = 63.3 minutes and standard deviation = 10.1 minutes. The finish times were approximately normally distributed.

a) What is the random variable in this example? Classify this variable as qualitative or quantitative, by type (nominal/ordinal/interval/ratio), and as continuous or discrete.

b) Between what times will the middle 75% of the runners finish the race? Round to the nearest tenth of a minute.

c) Would a finish time of 76.9 minutes be considered unusual? Explain.