The Average Time a Customer Service Executive Takes to Resolve

question 58

Essay

The average time a customer service executive takes to resolve an issue on a mobile handset is 26.4 minutes. The average times taken to resolve the issue by a sample of 15 such executives are shown below. $$\begin{array} { l | c } \text { Name } & \text { Time (in minutes) } \\\hline \text { Jack } & 25.3 \\\text { Samantha } & 28.2 \\\text { Richard } & 26.8 \\\text { Steve } & 29.5 \\\text { Mary } & 22.4 \\\text { Sergio } & 21.7 \\\text { John } & 24.3 \\\text { Michelle } & 22.4 \\\text { Linda } & 26.8 \\\text { Mark } & 29.4 \\\text { Matt } & 23.6 \\\text { Polly } & 26.4 \\\text { Sheila } & 23.5 \\\text { Jeff } & 26.8 \\\text { Gerald } & 28.1\end{array}$$
a. What is the mean resolution time?
b. What is the median resolution time?
c. What is the mode for these 15 executives?
d. What is the variance and standard deviation?
e. What is the third quartile?