The mean is the average of the number. In our case we have nine number, then the mean is
[tex]\operatorname{mean}=\frac{90+92+90+91+92+90+93+95+98}{9}[/tex]It gives
[tex]\begin{gathered} \operatorname{mean}=\frac{831}{9} \\ \operatorname{mean}=92.3 \end{gathered}[/tex]therefore, the answer is 92.3
