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Math·Problem-Solving and Data Analysis·Probability and conditional probability

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Classification	Frequency
igneous	10
metamorphic	27
sedimentary	13

Each rock in a collection of 50 rocks was classified as either igneous, metamorphic, or sedimentary, as shown in the frequency table. If one of these rocks is selected at random, what is the probability of selecting a rock that is igneous?

A

$\frac{10}{13}$

B

$\frac{10}{27}$

C

$\frac{10}{40}$

D

$\frac{10}{50}$