Suppose the probability of being picked first in your class is 0.05. The odds of being picked first expressed in form of a: b is 1 : 19.
A probability is a number that represents the possibility or chance that a specific event will occur.

From the given information;
- Let assume the total number of people in the class is whole = 1
∴
The odds of being picked first can be computed as:



= 1 : 19
Therefore, the odds of being picked first in terms of a: b is 1 : 19
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Answer:
For each part, find how many numbers have the stated characteristic, then divide by 21.
e.g. multiples of 5:
these would be 10, 15, 20, 25, and 30
so prob (a multiple of 5 ) = 5/21
Do the others the same way
Steps:
Step 1: Simplify both sides of the equation.
4x+3=9
Step 2: Subtract 3 from both sides.
4x+3−3=9−3
4x=6
Step 3: Divide both sides by 4.
4x /4 = 6 /4
Answer: x=
3/2
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<em><u>Hope this helps.</u></em>