Question

the blood groups of 30 students of class 9 are surveyed and recorded as below : if a student is chosen at random, find the t
probality that he has blood group of O or B
blood group =
A
B
AB
O
no. of students
9
6
3
12
total =30
​

Answer 1

Answer:

The probability is 18/30=3/5

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Answer 2

Answer:

probability having blood group B =

favorable outcomes

total outcomes

= 6

30

probability having blood group o = 12

30

probability having blood group o or b

= probability having blood group o + probability having blood group b

= 18

30