Answer:
Probability of selecting a cinder cone volcano = 0.330
Probability of selecting a shield volcano = 0.460
Probability of selecting a stratovolcano = 0.150
Explanation:
To create a probability model for Ella randomly selecting one volcano in the world, we can use the observed frequencies of the different types of volcanoes she has seen:
13 cinder cone volcanoes / 39 volcanoes seen = 0.33 (or 33%)
18 shield volcanoes / 39 volcanoes seen = 0.46 (or 46%)
6 stratovolcanoes / 39 volcanoes seen = 0.15 (or 15%)
We can use these fractions to calculate the probability of Ella selecting each type of volcano:
Probability of selecting a cinder cone volcano = 0.330
Probability of selecting a shield volcano = 0.460
Probability of selecting a stratovolcano = 0.150
To express these probabilities as decimals, we can round the fractions to the nearest hundredth:
Probability of selecting a cinder cone volcano = 0.33 ≈ 0.330
Probability of selecting a shield volcano = 0.46 ≈ 0.460
Probability of selecting a stratovolcano = 0.15 ≈ 0.150