Question

If probability of student pass is 0.87 then what is probability of its failed

Answer 1

It's very simple .....p(pass) + p(fail)= 1
always remember
so answer is 1-0.87=0.13

Answer 2

• The sum of the probability of total outcomes of an event is always 1 .

i.e., P ( E¹ ) + P ( E² ) = 1

Given is the probability of pass that is
P ( E¹ ) = 0.87

Let the probability of failed denoted by P ( E² )

P ( E¹ ) + P ( E² ) = 1

0.87 + P ( E² ) = 1

P ( E² ) = 1 - 0.87

P ( E² ) = 0.13

So, The probability of failed is 0.13