Advertisements
Advertisements
Question
An urn contains 10 red and 8 white balls. One ball is drawn at random. Find the probability that the ball drawn is white.
Advertisements
Solution
\[\text{ Number of red balls } = 10\]
\[\text{ Number of white balls }= 8\]
\[\text{ Total number of balls in the urn } = 10 + 8 = 18\]
\[\text{ Therefore, the total number of cases is 18 and the number of favourable cases is 8 }. \]
\[ \therefore P\left( \text{ The ball drawn is white }\right) = \frac{\text{ Number of favourable cases }}{\text{ Total number of cases }} = \frac{8}{18} = \frac{4}{9}\]
APPEARS IN
RELATED QUESTIONS
Tell whether the given is certain to happen, impossible, can happen but not certain.
The next traffic light seen will be green.
In a simultaneous throw of a pair of dice, find the probability of getting:
8 as the sum
A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is:
black and a king
A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is:
neither an ace nor a king
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?
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:
black
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
When two dice are rolled:
List the outcomes for the event that total is less than 5.
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?
A coin is tossed 15 times and the outcomes are recorded as follows:
H T T H T H H H T T H T H T T. The chance of occurrence of a head is 50 per cent.
