Answer
$M=2.786$
$median=2.5$
$mode=1$
Work Step by Step
$M=\frac{∑X}{N}=\frac{∑fX}{∑f}=\frac{1\times6+2\times5+2\times4+2\times3+2\times2+5\times1}{1+2+2+2+2+5}=\frac{39}{14}=2.786$
Since there are 14 scores ($N=14$), the median is the mean between the 7th and the 8th scores in ascending order:
$median=\frac{2+3}{2}=2.5$
The score $X=1$ has the greatest frequency ($f=6$).
$mode=1$
