Question

if P(A) =0.7 then find P(A')

Answer 1

Answer:

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Step-by-step explanation:

According to the equation

Probability of favourable events + Probability of not favourable events = 1

P(A) + P(A') = 1

P(A') = 1 - P(A)

= 1 - 0.7

P(A') = 0.3

Answer 2

If P(A) = 0.7 then P(A') = 0.3

Given :

P(A) = 0.7

To find :

P(A')

Solution :

Step 1 of 2 :

Write down the given probability

Here it is given that for the event A

P(A) = 0.7

Step 2 of 2 :

Find P(A')

We know that for any event A ,

P(A) + P(not A) = 1

In order words P(A) + P(A') = 1

Thus we get

P(A) + P(A') = 1

⇒ 0.7 + P(A') = 1

⇒ P(A') = 1 - 0.7

⇒ P(A') = 0.3

Hence P(A') = 0.3

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