A researcher was interested in the waiting time for an electricity fault to be fixed. A random sample of 250 electricity faults had a mode waiting time of 46.51 minutes, an average of 32.65 minutes and a median of 35.86 minutes.

a) Would you describe the shape of the waiting times to be symmetrical, positively skewed or negatively skewed? Briefly explain your reasoning.

b) Which of the measures of central tendency would you use to describe the typical value here? Why?

c) If the shortest waiting time was recorded incorrectly, and it was smaller, how, if at all, will the mode waiting time be affected? Briefly explain your reasoning.