
Answer-first summary for fast verification
Answer: 0.6
The cumulative distribution function (cdf) F(x) defines the probability of a random variable X, and assumes a value equal to or less than a specified value, x. As such: $$ F(30) = P(X \leq 30) \\ = P(X = 10) + P(X = 20) + P(X = 30) \\ = \frac{10}{100} + \frac{20}{100} + \frac{30}{100} \\ = 0.6 \text{ or } 60\% $$
Author: Tanishq Prabhu
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