The blood types for 30 people who agreed to participate in a medical study were as follows. $$\begin{array} { l l l l l l l l l l }
\mathrm { O } & \mathrm { A } & \mathrm { A } & \mathrm { O } & \mathrm { A } & \mathrm { AB } & \mathrm { O } & \mathrm { B } & \mathrm { A } & \mathrm { O } \
\mathrm { A } & \mathrm { O } & \mathrm { A } & \mathrm { B } & \mathrm { O } & \mathrm { O } & \mathrm { O } & \mathrm { AB } & \mathrm { A } & \mathrm { A } \
\mathrm { A } & \mathrm { B } & \mathrm { O } & \mathrm { A } & \mathrm { A } & \mathrm { O } & \mathrm { O } & \mathrm { B } & \mathrm { O } & \mathrm { O }
\end{array}$$

Question

The blood types for 30 people who agreed to participate in a medical study were as follows. $$\begin{array} { l l l l l l l l l l } 
\mathrm { O } & \mathrm { A } & \mathrm { A } & \mathrm { O } & \mathrm { A } & \mathrm { AB } & \mathrm { O } & \mathrm { B } & \mathrm { A } & \mathrm { O } \
\mathrm { A } & \mathrm { O } & \mathrm { A } & \mathrm { B } & \mathrm { O } & \mathrm { O } & \mathrm { O } & \mathrm { AB } & \mathrm { A } & \mathrm { A } \
\mathrm { A } & \mathrm { B } & \mathrm { O } & \mathrm { A } & \mathrm { A } & \mathrm { O } & \mathrm { O } & \mathrm { B } & \mathrm { O } & \mathrm { O }
\end{array}$$

Quizplus · Accepted Answer

The most common blood type is O, which appears 13 times in the list.

The Blood Types for 30 People Who Agreed to Participate