A group of students from a school decided to donate blood. The blood groups of 16 students of class X are recorded as follows:

A, B, O, O, AB, O, A, O, B, A, O, B, A, O, O, AB. Find the probability of blood group

a) O

b) A

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Solution

The sample space is S = { A, B, O, O, AB, O, A, O, B, A, O, B, A, O, O, AB}

n(S) = 16

a) n(O) = 7

P(O) = $\frac{n (O)}{n (S)}$ = $\frac{7}{16}$

b)n(A) = 4

P(A) = $\frac{n (A)}{n (S)}$ = $\frac{4}{16}$ = $\frac{1}{4}$

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A group of students from a school decided to donate blood. The blood groups of 16 students of class X are recorded as follows: A, B, O, O, AB, O, A, O, B, A, O, B, A, O, O, AB. Find the probability of blood group a) O b) A

The sample space is S = { A, B, O, O, AB, O, A, O, B, A, O, B, A, O, O, AB} n(S) = 16 a) n(O) = 7 P(O) = n(O)n(S) = 716 b)n(A) = 4 P(A) = n(A)n(S) = 416= 14

A group of students from a school decided to donate blood. The blood groups of 16 students of class X are recorded as follows:

A, B, O, O, AB, O, A, O, B, A, O, B, A, O, O, AB. Find the probability of blood group

a) O

b) A

The sample space is S = { A, B, O, O, AB, O, A, O, B, A, O, B, A, O, O, AB}

n(S) = 16

a) n(O) = 7

P(O) = $\frac{n (O)}{n (S)}$ = $\frac{7}{16}$

b)n(A) = 4

P(A) = $\frac{n (A)}{n (S)}$ = $\frac{4}{16}$ = $\frac{1}{4}$