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2197.2. Relative frequency

Task

It is known, that group consists of 15; 18; 12 but it is now known, how many times it repeats. About number 18 is known that relative frequency is three times bigger than for number 12. Numbers 18 and 12 relative frequency sum is equal with 0,6. What is every number relative frequency?

Write the correct answer!

Numbers 15 relative frequency:
Numbers 18 relative frequency:
Numbers 12 relative frequency:

What is every numbers absolute frequency, if members are 80?
Numbers 15 relative frequency:
Numbers 18 relative frequency:
Numbers 12 relative frequency:
Grade:
8
Subject
Algebra
Theme
Statistic elements
Subtheme
Relative frequency

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