To find the mean, first, we have to sum all the masses.
[tex]\begin{gathered} \Sigma x_i=3.4+4.3+2.4+2.4+4.2+4.3+4.3+3.5 \\ \Sigma x_i=28.8 \end{gathered}[/tex]Then, we divide this sum by the total number of masses which is 8.
[tex]\bar{x}=\frac{28.8}{8}=3.6[/tex]