Advertisements
Advertisements
Question
A bag contains 3 red balls and 5 black balls. A ball is drawn at random from the bag. What is the probability that the ball drawn is:
red
Solution
\[\text{ Number of red balls } = 3\]
\[\text{ Number of black balls } = 5\]
\[\text{ Total number of balls }= 3 + 5 = 8\]
\[\text{ Let A be the event of drawing a red ball } . \]
\[ \therefore P\left( A \right) = \frac{\text{ Number of favourable outcomes }}{\text{ Total number of outcomes }} = \frac{3}{8}\]
APPEARS IN
RELATED QUESTIONS
Tell whether the given is certain to happen, impossible, can happen but not certain.
Tomorrow will be a cloudy day.
In a simultaneous throw of a pair of dice, find the probability of getting:
a doublet of prime number
In a simultaneous throw of a pair of dice, find the probability of getting:
at least once
A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is:
neither a heart nor a king
A bag contains 4 red, 5 black and 6 white balls. A ball is drawn from the bag at random. Find the probability that the ball drawn is:
red or white
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.
A glass jar contains 6 red, 5 green, 4 blue and 5 yellow marbles of same size. Hari takes out a marble from the jar at random. What is the probability that the chosen marble is of red colour?
In throwing a die the number of possible outcomes is ______.
Rohit collected the data regarding weights of students of his class and prepared the following table:
| Weight (in kg) | 44 – 47 | 48 – 51 | 52 – 55 | 56 – 60 |
| Number of Students | 3 | 5 | 25 | 7 |
A student is to be selected randomly from his class for some competition. The probability of selection of the student is highest whose weight is in the interval ______.
