Advertisements
Advertisements
Question
A bag contains 3 red balls, 5 black balls and 4 white balls. A ball is drawn at random from the bag. What is the probability that the ball drawn is:
red?
Solution
\[\text{ Number of red balls }= 3\]
\[\text{ Number of black balls } = 5 \]
\[\text{ Number of white balls } = 4\]
\[\text{Total number of balls } = 3 + 5 + 4 = 12\]
\[\text{ Therefore, the total number of cases is }12 . \]
\[\text{ Since there are 3 red balls, the number of favourable outcomes is 3 }. \]
\[P\left(\text{ a red ball } \right) = \frac{\text{ Number of favourable cases }}{\text{ Total number of cases }} = \frac{3}{12} = \frac{1}{4}\]
APPEARS IN
RELATED QUESTIONS
Find the probability of getting an ace from a well shuffled deck of 52 playing cards.
Tell whether the given is certain to happen, impossible, can happen but not certain.
You are older today than yesterday.
In a simultaneous throw of a pair of dice, find the probability of getting:
an even number on one and a multiple of 3 on the other
A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is:
neither a red card nor a queen.
A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is:
a queen
A bag contains 5 red marbles, 8 white marbles, 4 green marbles. What is the probability that if one marble is taken out of the bag at random, it will be
not green
If you put 21 consonants and 5 vowels in a bag. What would carry greater probability? Getting a consonant or a vowel? Find each probability.
If you have a collection of 6 pairs of white socks and 3 pairs of black socks. What is the probability that a pair you pick without looking is
black?
In a school only, 3 out of 5 students can participate in a competition. What is the probability of the students who do not make it to the competition?
When a spinner with three colours (Figure) is rotated, which colour has more chance to show up with arrow than the others?
