Question

The blood group of the students of a class are given in the
following table.
Blood group. A AB B O
No.of students. 8 12 9 5
If a student is selected at random from the class, find the probability
for the blood group of that boy to be 'B'.​

Answer 1

Step-by-step explanation:

probability is 0.264705882

Answer 2

$Number \: of \:Blood \: group \: \red{ A}\\student = 8$

$Number \: of \:Blood \: group \: \red{ AB}\\student = 12$

$Number \: of \:Blood \: group \: \red{ B}\\student = 9$

$Number \: of \:Blood \: group \: \red{ O}\\student = 5$

$Number \:of \: total \: possible \: outcomes\\= Total \:students \:in \:the \:class \\= 8 + 12 + 9 + 5 \\= 34 \: ---(1)$

$Number \: of \: favourable \: outcomes \\= Number \: of \:Blood \: group \: \red{ B}\\student = 9 \: ---(2)$

$Probability \: selected \: boy \: to\: be \\blood \: group \: B = \frac{(2)}{(1)}\\= \frac{9}{34}$

Therefore.,

$\red { Probability } \green { = \frac{9}{34}}$

•••♪