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Q: Why do the probability of an event and the probability of its complement add up to 1?
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What does complementary mean in math?

In geometry, a pair of complementary angles are a pair which add up to equal 90 degrees.In probability, the complement of an occurrence of an event is the non-occurrence of an event.


What is the complement of a 31 degree angel?

Complementary angles add up to 90°. The complement of 31° is 90 - 31 = 59°.


What is the multiplication rule?

States that to determine a probability, we multiply the probability of one event by the probability of the other event. Ex: Probability that two coins will land face heads up is 1/2 x 1/2 = 1/4 .


What is the complement of a 21.6 degree angle?

The two angle measures have to add up to 90, therefore the complement two 21.6 is 68.4


What is the complement of 61.8 degrees?

Complements add up to 90 degrees, so the complement of 61.8 would be 28.2. (61.8 + 28.2 = 90).


If y equals 53 degrees what is the complement of y?

The complement of an angle is the degree which makes the angle add up to 90 degrees. Therefore: complement of y= 90-53 = 37.


What does complement and supplement angles mean?

Complementary angles add up to 90 degrees whereas supplementary angles add up to 180 degrees


Write the 100-complement of 20?

80


Is a complement angle ninety degrees?

A complementary angle is when two angles add up to 90o.


What is the complement of the complement of an angle?

It is 9 degrees because complementary angles add up to 90 degrees


How big can a probability be?

When dealing with probability there is a range of values of the probability of an event. The probability of an event (E) is any number (fraction or decimal) between zero and one. (0≤ P(E)≤1)When an event is certain to occur the probability of E is 1. This means that there is 100% that something will happen. This is why your sum of all the probabilities must add up to equal 1.For example: Flip a coin. You have a 50% chance of it landing on heads and a 50% chance of it landing on tails since there are only two possibilities.Let H=headsLet T=tails∑P= P(H)+P(T)=0.5+0.5=1This is telling you, you have a 100% chance of it landing on either heads or tails.If the event cannot happen the event contains no members in the sample space so its probability is zero.For example: Roll a single die one time. Find the probability of rolling a 7:This cannot happen so the probability is zero.


The supplement of an angle is 130 degrees.Find the complement of the angle.?

supplementary angles add up to 180 degrees complimentary angles add up to 90 degrees