there are 60 students in a class out of which 30 are boys .in other class there are 50 students out of which 25 are boys.lf one student is to be chosen for monitorship what is the probabilty that both are girls.what is the probability that atleast one is girl.
Answers
Answer:
55/110 =11/22=1/2
Step-by-step explanation:
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Answer:
1/4 , 3/4
Step-by-step explanation:
probability of selecting girl in class A(60 students) be PE
PE = No.of girls in class A / Total no.of students in class A
PE = 30/60 = 1/2
same goes for class B (50 Students) ie. PE'= 1/2
sample space - {G,B} , {B,B} , {G,G} , {B,G}
Probability of selecting 2 girls = favourable outcome in sample space/
total sample spaces
= 1/4 ( favourable outcome is {G,G} )
Probability of selecting atleast one girl means sample space should have minimum one girl
Probability of this event = favourable outcome in sample space/
total sample spaces
= 3/4 { favourable outcomes are {G,G} , {G,H} , {B,G} )