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A person rolls a 10-sided die once. What are the odds that the number rolled is not greater than or equal to 5? Write your answer as a ratio, such as 1:2, and reduce as much as possible.

A person rolls a 10sided die once What are the odds that the number rolled is not greater than or equal to 5 Write your answer as a ratio such as 12 and reduce class=

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The Solution:

Given:

[tex]10-sided\text{ die}=\lbrace1,2,3,4,5,6,7,8,9,10\rbrace=10[/tex]

The number rolled is not greater than or equal to 5.

That is,

[tex]\lbrace1,2,3,4\rbrace=4[/tex]

The required odds in ratio form is:

[tex]4:10=2:5[/tex]

Therefore, the correct answer is: 2 : 5