CBSE Class 10 Answered
a family consists of 3 children.if 1 child is selected at random ,what is the probability of getting a)2 boys b)atleast 1 girl c)no boys.
Asked by | 27 Oct, 2012, 11:51: AM
Expert Answer
Answer : Given : a family consists of 3 children.
To find :The probability if 1 child is selected at random is a)2 boys b)atleast 1 girl c)no boys.
Let B denote a boy and G a girl
Each birth can be either a B or G so 2 ways and since 4 events or birth,
the sample space is of size = 2 x 2 x 2 = 8
(a) There are exactly two boys
Events with exactly 2 boys are: {BBG, BGB, GBB} = 3 in set
P[ exactly 2 boys] = 3/8
(b) Atleast 1 girl.
Event all children are girls:{GBB,BGB,BBG,GGB,GBG,BGG,GGG}
Pr[all girls] =7/8
c) No boy
P[no boy] = {GGG} =1/8
The sample space is : { BBB,BBG,BGB,GBB,BGG,GBG,GGB,GGG}
Answered by | 27 Oct, 2012, 06:44: PM
CBSE 10 - Maths
Asked by Prince Sonu | 05 Jan, 2013, 01:42: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by | 11 Dec, 2012, 02:57: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by shubham deshpande | 21 Nov, 2012, 07:48: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by Mohit gulia | 29 Oct, 2012, 08:18: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by Mohit gulia | 28 Oct, 2012, 08:59: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by | 27 Oct, 2012, 11:51: AM
ANSWERED BY EXPERT