Page 306 - Start Up Mathematics_7

(e) The sum of two odd numbers is even
(f) Drawing a red card from a well-shuffled deck of playing cards

(g) Getting an odd number when a die is thrown once
3. A box contains 3 red balls, 7 black balls and 5 green balls. One ball is drawn from the box

at random. Find the probability of drawing a:
(a) green ball (b) black or red ball (c) ball that is not black
4. A coin is tossed twice.

(a) List the outcomes of the sample space.

(b) List the outcomes of the event of getting at least one tail.
(c) List the outcomes of getting exactly one head.
(d) Write probabilities of the event described in parts (a), (b) and (c) above.

5. If one letter is chosen at random from the word “MATHEMATICS”, find the probability
of:

(a) getting M (b) getting A (c) getting S (d) getting a vowel
6. A card is drawn from a well-shuffled deck of 52 cards. Find the probabilities of each of the
following:

(a) a black card (b) a king (c) not a spade
(d) an ace (e) an ace of spade

Maths Lab Activity

Conduct the following experiment and fill the given table:
A paper glass is tossed in the air. The different ways it can land are:

bottom top side

Toss the glass 30 times and keep the record of the outcomes.

Event Tally bars Frequency
Bottom
Top
Side

(a) From the data so collected find the experimental probability of each outcome.

(b) What is the theoretical or classical probability of these outcomes?
(c) On increasing the number of trials, the experimental probabilities of the events discussed
above comes closer and closer to the theoretical or classical probabilities. Do you agree?

Give reasons.

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