Answer :
[tex]\boxed{\sf Mean=\dfrac{Sum\:of\:terms}{No\:of\:terms}}[/tex]
[tex]\\ \sf\longmapsto Mean=\dfrac{12+19+38+52+55}{5}[/tex]
[tex]\\ \sf\longmapsto Mean=\dfrac{176}{5}[/tex]
[tex]\\ \sf\longmapsto Mean=35.2[/tex]
[tex]\boxed{\sf Mean=\dfrac{Sum\:of\:terms}{No\:of\:terms}}[/tex]
[tex]\\ \sf\longmapsto Mean=\dfrac{12+19+38+52+55}{5}[/tex]
[tex]\\ \sf\longmapsto Mean=\dfrac{176}{5}[/tex]
[tex]\\ \sf\longmapsto Mean=35.2[/tex]