It is the proportion of the spinner's perimeter that is occupied by the section (or sections) with a value of 1.
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The probability of spinning the spinner and landing on an odd number depends on the number of odd numbers on the spinner and the total number of numbers on the spinner. If there are 3 odd numbers on the spinner and a total of 6 numbers, then the probability of landing on an odd number is 3/6, which simplifies to 1/2 or 50%.
7
It is 4/8 = 1/2
1/10
Probability of a spinner of 20 landing on 5 is 1/20.