Probability - JSS2 Mathematics Past Questions and Answers - page 1
When you flip a fair coin, what is the probability of getting tails?
1/2
1/3
1/4
What is the probability of rolling a 5 on a fair six-sided die?
1/6
1/3
In a standard deck of cards, what is the probability of drawing a heart?
1/13
1/4
1/2
If a weather forecast predicts a 40% chance of snow tomorrow, what is the probability it will not snow?
0.4
0.6
0.8
What is the probability of drawing a red marble from a jar containing 5 red marbles and 3 blue marbles?
5/8
3/8
1/2
If a spinner is divided into 4 equal parts colored red, blue, green, and yellow, what is the probability of landing on green?
1/2
1/4
1/3
You flip a fair coin three times. What is the probability of getting exactly two heads?
Total possible outcomes when flipping a coin three times = 2/3
= 8 outcomes (HHH, HHT, HTH, HTT, THH, THT, TTH, TTT).
Favorable outcomes (exactly two heads) = {HHT, HTH, THH} = 3 outcomes.
Probability = Number of favorable outcomes / Total outcomes = 3/8.
You roll two fair six-sided dice. What is the probability that the sum of the numbers rolled is 7?
Total possible outcomes when rolling two dice
= 6×6
=36 outcomes.
Outcomes where the sum is 7: (1,6), (2,5), (3,4), (4,3), (5,2), (6,1) = 6 outcomes.
Probability = Number of favorable outcomes / Total outcomes = 6/36
=1/6.
From a standard deck of 52 cards, what is the probability of drawing a face card (king, queen, or jack)?
Number of face cards in a deck = 12 (4 kings + 4 queens + 4 jacks).
Total cards in the deck = 52.
Probability = Number of face cards / Total cards =
12/52=3/13.
A bag contains 5 red marbles, 3 blue marbles, and 2 green marbles. If one marble is drawn at random, what is the probability that it is either red or blue?
Total number of marbles = 5 (red) + 3 (blue) + 2 (green) = 10 marbles.
Number of favorable outcomes (red or blue marbles) = 5 (red) + 3 (blue) = 8 marbles.
Probability = Number of favorable outcomes / Total outcomes =
8/10=4/5.