Question

The following table shows the blood-groups of employees in a bank.
Event C is : ‘the blood-group of an employee is AB.’  

Blood - group	A	B	AB	0
No. of employees	20	40	15	25

If an employee is chosen at random, what is the probability that his blood-group is AB ?
Fill in the following boxes and find the answer
n(S)=  ______

n(C)= ______ 

p(C)=________=_________

Answer 1

n(S)=`20+40+15+25=100` 

`n(C)=15`

`p(C)=(n(c))/(n(p))``15/100=3/20`