Probability
Many events can't be predicted
with total certainty. The best we can say is how likely they are to happen, using the idea of probability.
Tossing a Coin
When a coin is tossed, there
are two possible outcomes:
·
heads (H)
or
·
tails (T)
We say that the probability of
the coin landing H is ½.
And the probability of the
coin landing T is ½.
Throwing Dice
When a single die is thrown,
there are six possible outcomes:
1, 2, 3, 4, 5, 6.
The probability of any one of
them is 1/6.
Video of Probability:
Video of Probability:
Here are some few question for you to try it out with:
Question 1:
A box contains 5 pink marbles and 21 yellow marbles. Sharon puts another 4 pink marbles and 1 yellow marble inside the box. A marble is chosen at random from the box.
What is the probability that a pink marble is chosen?
Question 2:
In a group of 80 prefects, 25 are girls. Then 10 boys leave the group.
If a prefect is chosen at random from the group, state the probability that the prefect chosen is a boy.
In a group of 80 prefects, 25 are girls. Then 10 boys leave the group.
If a prefect is chosen at random from the group, state the probability that the prefect chosen is a boy.
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