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
Answers
Answered by
1
Answer:
The probability is 18/30=3/5
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Answered by
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
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