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

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Standard X

Mathematics

Calculate Probability as a Number

In a medical ...

Question

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:

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Solution

Total number of students in the medical examination, n(S) = 40
Number of students who have $B -$ blood group, n(E) = 12
$∴$ Probability that he/she has blood group $B -$ $= \frac{n (E)}{n (S)} = \frac{12}{40} = \frac{3}{10}$

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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) $\frac{1}{4}$
B) $\frac{13}{40}$
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}

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

Blood group A AB B O

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.

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

Blood group	A	B	AB	O
Number of students	11	15	8	6

From this class, a student is chosen at random. What is the probability that the chosen student has blood group AB?

(a)

\frac{13}{20}

(b)

\frac{3}{8}

(c)

\frac{1}{5}

(d)

\frac{11}{40}

Q. 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 __________.

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In a medical examination of students of a class, the following blood groups are recorded. Blood groupA+AB−B−O+Number of1013125students A student is selected at random from the class. The probability that he/she has blood group B− is:

Total number of students in the medical examination, n(S) = 40 Number of students who have B− blood group, n(E) = 12 ∴ Probability that he/she has blood group B− =n(E)n(S)=1240=310

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:

Total number of students in the medical examination, n(S) = 40
Number of students who have $B -$ blood group, n(E) = 12
$∴$ Probability that he/she has blood group $B -$ $= \frac{n (E)}{n (S)} = \frac{12}{40} = \frac{3}{10}$