Q1 of 32 Page 25

The probability of an impossible event is

The event is known ahead of time to be not possible, therefore by definition in mathematics, the probability is defined to be 0 which means it can never happen.

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7

Three coins are tossed simulateneously 200 times with the following frequencies of different outcomes:

















Outcome



3 heads



2 heads



1 head



No head



Frequency



23



72



77



28



Find the probability of getting at most two heads.

 8

what is the probability of getting at least two heads?

 2

The probability of a certain event is

 3

The probability of an event of a trials is