Advertisements
Advertisements
प्रश्न
A dice is thrown 20 times and the outcomes are noted as shown below:
| Outcomes | 1 | 2 | 3 | 4 | 5 | 6 |
| No. of times | 2 | 3 | 4 | 4 | 3 | 4 |
Now a dice is thrown at random, find the probability of getting:
उत्तर
∵ Total number of outcomes = 20
(i) P (getting 3) = `4/20=1/5`
(ii) A number less than 3 (1, 2) will appear = 2 + 3 = 5 times
∴ Probability = `5/20=1/4`
(iii) A number greater than 3 (4, 5, 6) will appear = 4 + 3 + 4 = 11 times
∴ Probability = `11/20`
APPEARS IN
संबंधित प्रश्न
A survey of 50 boys showed that 21 like tea while 29 dislike it. Out of these boys, one boy is chosen at random. What is the probability that the chosen boy
(i) likes tea
(ii) dislikes tea
There are 8 marbles in a bag with numbers from 1 to 8 marked on each of them. What is the probability of drawing a marble with a number
(i) 3
(ii) 7
Two coins are tossed simultaneously 100 times and the outcomes are as given below:
| Outcomes | Two heads (H, H) |
Exactly one head (H T or T H) |
No head (T T) |
| No. of times | 21 | 55 | 24 |
If the same pair of coins is tossed again at random, find the probability of getting:
(i) two heads
(ii) exactly one head
(iii) no head.
In a single throw of a dice, find the probability of getting a number 4
Hundred identical cards are numbered from 1 to 100. The cards are well shuffled and then a card is drawn. Find the probability that the number on the card drawn is 40
Suppose S is the event that will happen tomorrow and P(S) = 0.03. State in words, the complementary event S’.
Suppose S is the event that will happen tomorrow and P(S) = 0.03. Find P(S’)
A Ticket is randomly selected from a basket containing 3 green, 4 yellow, and 5 blue tickets. Determine the probability of getting:
(i) a green ticket
(ii) a green or yellow ticket.
(iii) an orange ticket.
A carton contains eight brown and four white eggs. Find the probability that an egg selected at random is:
(i) brown
(ii) white
The following table shows number of males and number of females of a small locality in different age groups.
| Age in years | 10-20 | 21-50 | Above 50 |
| Male | 8 | 12 | 6 |
| female | 6 | 10 | 4 |
If one of the persons, from this locality, is picked at random, what is the probability that
- the person picked is a male?
- the person picked is a female?
- the person picked is a female aged 21-50?
- the person is a male with age up to 50 years?
