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In a medical examination of students of a class, the following blood groups are recorded:

Blood group: A AB B O
Number of students: 10 13 12 5

A student is selected at random from the class. The probability that he/she has blood group B, is __________.

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Solution

Total number of students in the class = 10 + 13 + 12 + 5 = 40

Number of students having blood group B = 12

∴ P(A student selected at random has blood group B)

= $\frac{Number of students having blood group B}{Total number of students in the class}$

= $\frac{12}{40}$

= $\frac{3}{10}$

Thus, the probability that a student selected at random from the class has blood group B is $\frac{3}{10}$ .

A student is selected at random from the class. The probability that he/she has blood group B, is $\frac{3}{10}$ .

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In a medical examination of students of a class, the following blood groups are recorded:

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No. of students 10 13 12 5

A student is selected at random from the class. Find the probability that he/she has blood group B.

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Blood group	A	AB	B	O
No of student	10	13	12	5

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Q. In a medical examination of students of a class, the following blood groups are recorded.

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Question 27
In a medical examination of students of a class, the following blood groups are recorded.

$\begin{matrix} Blood group & A & A B & B & O Number of & 10 & 13 & 12 & 5 students \end{matrix}$

A student is selected at random from the class. The probability that he/she has blood group B is:

A) $\frac{1}{4}$
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C) $\frac{3}{10}$
D) $\frac{1}{8}$

Q. Question 27
In a medical examination of students of a class, the following blood groups are recorded.

\begin{matrix} B l o o d g r o u p & A & A B & B & O N u m b e r o f & 10 & 13 & 12 & 5 s t u d e n t s \end{matrix}

A student is selected at random from the class. The probability that he/she has blood group B is:

A)

\frac{1}{4}

\frac{13}{40}

\frac{3}{10}

\frac{1}{8}

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Fill In The Blanks In a medical examination of students of a class, the following blood groups are recorded: Blood group: A AB B O Number of students: 10 13 12 5 A student is selected at random from the class. The probability that he/she has blood group B, is __________.

Fill In The Blanks

In a medical examination of students of a class, the following blood groups are recorded:

Blood group: A AB B O
Number of students: 10 13 12 5

A student is selected at random from the class. The probability that he/she has blood group B, is __________.