Likelihood of Events

Cup-Tossin

Def: __Probability__—the likelihood that an event will
occur.

certain

Def: __Experiment__—a process that when performed results
in one and only one outcome.

EX: Toss a
cup—record how it lands

Def: __Outcomes__—the observations of an experiment.

EX: Side,
Upside-Down, Right-Side Up

Def: __Sample Space__—the collection of all outcomes for
an experiment (denoted: S).

EX: S = {Side,
Upside-Down, Right-Side Up}

Right-side up

Def: Impossible Event—an event that absolutely cannot occur.

Def: Certain Event—an event that is guaranteed to occur
(aka—sure event).

Randomness

--A random event is one in which we are not sure of exactly
what will happen even though we know the possible outcomes and we can predict a
long-term pattern.

EX: Tossing a Coin

We know we
will either get heads or tails. But, on any
given toss we do not know what we
will get. We expect, though, to get
heads about half of the time.

Heads or Tails

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