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In a group of 120 people, 90 have an age of more 30 years, and the others have an age of less than 20 years. If a person is selected at random from this group, what is the probability the person's age is less than 20?

Respuesta :

Answer:

0.25

Step-by-step explanation:

Number of people whose age is less than 20 is given by

120 - 90 = 30

Probability P that a person selected at random from the group is less than 20 is gieven by

30 / 120 = 0.25

Person having age less than 20=120-90=30

  • |S|=120
  • |E|=30

[tex]\\ \tt\hookrightarrow P(E)=\dfrac{|E|}{|S|}[/tex]

[tex]\\ \tt\hookrightarrow P(E)=\dfrac{30}{120}[/tex]

[tex]\\ \tt\hookrightarrow P(E)=\dfrac{1}{4}[/tex]

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