Question

 If P(A) = 0.72 then P(notA) = ? *​

Answer 1

Given:

Given values are: $P(A) = 0.72$.

To find:

We need to find the value of $P(\tilde{A})$.

Solution:

Probability is nothing but possibility. It is a subset of mathematics that deals with a random occurrence happening.

The probability of occurring an event is less than or equal to 1.

In this question, the event is A.

We know that, the sum of probability of occurring an event and not occurring an event is equal to 1.

That is, $P(A) +P(\tilde{A}) = 1$

$\Rightarrow P(A) +P(\tilde{A}) = 1$

$\Rightarrow 0.72 +P(\tilde{A}) = 1$

Rearranging the terms,

$\Rightarrow P(\tilde{A}) = 1-0.72$

$\Rightarrow P(\tilde{A}) = 0.28$

Therefore, the value of $P(\tilde{A}) = 0.28$.