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Sagot :
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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