Your School's Recruiting Staff Is Planning a Multi-Country Road Trip

Your school's recruiting staff is planning a multi-country road trip to Africa and the Middle East. Staff members will visit eight cities over a two-week period, and will set up an elaborate display, booth, and audio-visual show in each city. They have been reviewing last year's tour and discovered some information about how long the setup was in the same cities. Unfortunately, they do not have data for all cities. The data they do have are displayed below:
$$\begin{array} { | l | c | } \hline \begin{array} { l } \text { City (in order of } \\\text { visit) }\end{array} & \begin{array} { c } \text { Time Required for Setup Last } \\\text { Year }\end{array} \\\hline \text { (1) Lagos } & \text { 14 hours } \\\hline \text { (2) Casablanca } & \text { Unknown } \\\hline \text { (3) Khartoum } & 8.876 \text { hours } \\\hline \text { (4) Nairobi } & 7.875 \text { hours } \\\hline\end{array}$$
$\begin{array}{|l|}\hline \text {It is possible to solve this problem without a leaming curve table, but we advise the }\\\text {instructor to include one at the end of the exam for those students who would like to }\\\text { use it. }\\\hline \end{array}$
What rate of learning can the team estimate from the available data? round to the nearest whole number)

A) About 32 %
B) About 56 %
C) About 63 %
D) About 75 %
E) About 85 %
F) None of these, the answer is:____________ show your work or explain)