Probability 28111

1. What is the probability that we write an even number from the numbers from 1 to 20?
2. We randomly draw one ticket From the eighteen tickets numbered 1 - 18. What is the probability that the ticket drawn will have:
a) a number divisible by 3
c) a prime number
d) a number divisible by 6

Correct answer:

p₁ =  0.5
p₂ =  0.3333
p₃ =  0.3889
p₄ =  0.1667

Step-by-step explanation:

$p_1=\frac{10}{20}=\frac{1}{2}=0.5$

$$\begin{gathered} 3;6;9;12;15;18 \\ {p}_2=\frac{6}{18}=\frac{1}{3}=0.3333 \end{gathered}$$

$$\begin{gathered} 2;3;5;7;11;13;17 \\ {p}_3=\frac{7}{18}=0.3889 \end{gathered}$$

$$\begin{gathered} 6;12;18 \\ {p}_4=\frac{3}{18}=\frac{1}{6}=0.1667 \end{gathered}$$

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