Page 90 - Mathematics Class - XII

Unit VI Probability
Probability

TOPIC - 8: Probability

ACTIVITY 8.1

OBJECTIVE
To explain the computation of conditional probability of a given event A, when event B has already occurred,
through an example of throwing a pair of dice.

MATERIAL REQUIRED
Y Cardboard or plywood of convenient size Y pen/pencil

Y white chart paper Y scale
Y glue stick Y a pair of dice

PRE-REQUISITE KNOWLEDGE
1. Knowledge of concept of probability and terms related to it (like: random experiment, sample space,
event, equally likely events, etc.)
2. Knowledge of concept of conditional probability.

PROCEDURE
1. Paste white chart paper on a piece of plywood or cardboard of convenient size.

2. Make a square and divide it into 36 unit squares of size 1 cm each (Fig. (a)).
3. Write pair of numbers as shown in the figure.

1, 1 1, 2 1, 3 1, 4 1, 5 1, 6

2, 1 2, 2 2, 3 2, 4 2, 5 2, 6

3, 1 3, 2 3, 3 3, 4 3, 5 3, 6

4, 1 4, 2 4, 3 4, 4 4, 5 4, 6

5, 1 5, 2 5, 3 5, 4 5, 5 5, 6

6, 1 6, 2 6, 3 6, 4 6, 5 6, 6

Fig. (a)
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