this is your question

cinder cone volcanoes= 13
shield volcanoes= 18
stratovolcanoes= 6
[tex]13 + 18 + 6[/tex]
[tex] = 37[/tex]
[tex] \frac{13}{37} [/tex]
[tex] = 0.35[/tex]
[tex] \frac{18}{37} [/tex]
[tex] = 0.49[/tex]
[tex] \frac{6}{37} [/tex]
[tex] = 0.17[/tex]