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15. Probability
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Q19 of 50 Page 15

Three coins are tossed simultaneously. Find the probability of getting two heads.

Explanation:


Total possible outcomes = {(H, H, H), (H, H, T), (H, T, H), (H, T, T), (T, T, H), (T, H, T), (T, T, T), (T, H, H)}


Favourable outcomes = {(H, H, T), (H, T, H), (T, H, H)}


Now,




Hence, the probability of getting two heads in 3/8.


More from this chapter

All 50 →
17

The following table gives the life time of 400 neon lamps:

A bulb is selected at random. Find the probability that the lifetime of the selected bulb is:

(i) less than 400


(ii) between 300 to 800 hours


(iii)at least 700 hours.

18

Tickets numbered 1 to 15 are mixed up, and then a ticket is drawn at random. What is the probability that the ticket drawn is a multiple of 4?

20

The blood groups of 30 students of class IX are recorded as follows :

A, B, O, O, AB, O, A, O, B, A, O, B, A, O, O


A, AB, O, A, A, O, O, AB, B, A, O, B, A , B, O


A student is selected at random from the class from blood donation. Find the probability that the blood group of the student chosen is :


(i) A


(ii) B


(iii) AB


(iv) O

21

The record of a weather station shows that out of the past 250 consecutive days, its weather forecast was correct 175 times. What is the probability that on a given day

(i) Was it correct?


(ii) Was it incorrect?

Questions · 50
15. Probability
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