Question

In a medical examination of students of a class of 40 students, the following blood groups were recorded :
Blood group A,AB, B, O
Number of Students 15,12,3,10
A student is selected at random from the class. Find the probability that the student has the blood group
(i)
either B or 0.
(ii)
AB​

Answer 1

Answer:

$\red{ P(B \:or \:O) } \green { =\frac{13}{40}}$

$\red{ P(AB) } \green { =\frac{3}{10}}$

Step-by-step explanation:

$Number \:of \:Total \: possible\: outcomes\\ = Total \: students \:in \:the \:class \\= \pink {40}\:--(1)$

$A \: Group = 15\\AB\:Group = 12\\B\: group = 3\\O \: group = 10$

$( Total \: students = 15+12+3+10 = 40 )$

$i) A \: student \:is \: selected \:at \: random \\from \:class\:the \: probability \:that \:the \\ student\:has \:blood \:group \: either \: B \:or \:O$

$Number \:of \: favourable \: outcomes = 13\:--(2)$

$Probability = \frac{(2)}{(1)}\\= \frac{13}{40}$

$P( AB) = \frac{12}{40}\\= \frac{3}{10}$

Therefore.,

$\red{ P(B \:or \:O) } \green { =\frac{13}{40}}$

$\red{ P(AB) } \green { =\frac{3}{10}}$

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