Eitan randomly selected volcanoes to travel to and study. After visiting, he had seen.

13

1313 cinder cone volcanoes,

18

1818 shield volcanoes, and

6

66 stratovolcanoes.

Use the observed frequencies to create a probability model for Eitan randomly selecting one volcano in the world on which to conduct an extensive study.

Input your answers as fractions or as decimals rounded to the nearest hundredth.

Type of volcano Estimated probability

Cinder cone

Shield

Stratovolcano

Type of volcano Frequency Probability
Cinder cone
13
1313
13
37
≈
0.35
37
13

≈0.35start fraction, 13, divided by, start color #6495ed, 37, end color #6495ed, end fraction, approximately equals, 0, point, 35
Shield
18
1818
18
37
≈
0.49
37
18

≈0.49start fraction, 18, divided by, start color #6495ed, 37, end color #6495ed, end fraction, approximately equals, 0, point, 49
Stratovolcano
6
66
6
37
≈
0.16
37
6

≈0.16start fraction, 6, divided by, start color #6495ed, 37, end color #6495ed, end fraction, approximately equals, 0, point, 16
Total
37
37start color #6495ed, 37, end color #6495ed
1
11