Advertisements
Advertisements
प्रश्न
A coin is tossed 100 times with the following frequency:
Head = 55, Tail = 45
find the probability of getting tail.
उत्तर
Event = {tail}
n(E) = 45
∴ Probability of event = `"n(E)"/"n(S)" = 45/100 = 9/20`.
APPEARS IN
संबंधित प्रश्न
A die is thrown twice. What is the probability that
- 5 will not come up either time?
- 5 will come up at least once?
[Hint: Throwinga die twice and throwing two dice simultaneously are treated as the same experiment].
A box contains 12 balls out of which x are black. If one ball is drawn at random from the box, what is the probability that it will be a black ball?
If 6 more black balls are put in the box, the probability of drawing a black ball is now double of what it was before. Find x.
A black die and a white die are thrown at the same time. Write all the possible outcomes. What is the probability that the sum of the two numbers appearing on the top of the dice is 13?
Fill in blank:
The probability of an event (other than sure and impossible event) lies between……
Fill in blank:
Probability of an event A + Probability of event ‘not A’ ...........
Seven cards:- the eight, the nine, the ten, jack, queen, king and ace of diamonds are well shuffled. One card is then picked up at random.
If the king is drawn and put aside, what is the probability that the second card picked up is:
- an ace?
- a king?
A bag contains 100 identical marble stones which are numbered 1 to 100. If one stone is drawn at random from the bag, find the probability that it bears a number divisible by 4 and 5.
In a game of chance, a spinning arrow comes to rest at one of the numbers 1, 2, 3, 4, 5, 6, 7, 8. All these are equally likely outcomes. Find the probability that it will rest at an odd number.
1000 families with 2 children were selected randomly , and the following data were recorded :
| Number of girls in a family | 0 | 1 | 2 |
| Number of families | 333 | 392 | 275 |
Find the probability of a family , having
(ii) 2 girls
When a die is thrown, the probability of getting an even number less than 4 is ______.
