Suppose that P(A)= x. The probability of the complementary event B is 0.7, what is the value of x.

would it be 0.3

Yes

thanks for your help

To determine the value of x, we need to consider the relationship between the event A and its complementary event B.

The complementary event B is the event that A does not occur. In other words, B consists of all outcomes that are not included in A. Therefore, the probability of event B is equal to 1 minus the probability of event A.

Given that the probability of event B is 0.7, we can write this as:

P(B) = 0.7

Since event B is the complementary event of A, we have:

P(B) = 1 - P(A)

Substituting the given value of P(B) into the equation, we get:

0.7 = 1 - P(A)

Rearranging the equation, we can solve for P(A):

P(A) = 1 - 0.7
P(A) = 0.3

Therefore, the value of x, which represents the probability of event A, is indeed 0.3.