Answer:
The probability of picking a black card at random, from a deck with 3 black cards and 7 red ones is 0.3.
Step-by-step explanation:
We will assume that we have 3 black cards and 7 black cards, for a total of 10 cards. Since we are taking one card at random, we can assume that each card is equally likely to be drawn. We have the following event A: The drawn card is a black. We will find the probability of A as counting the number of outcomes that make A to occur and divide it by the total number of possibilities. We are drawing one card, so we have 10 possibilities to be picked. Out of those 10, only 3 cards are black, hence we have 3 possibilites of picking a black card.
Then,
P(A) = 3/10 = 0.3.
Answer:
0.435 Got it from Khan
Step-by-step explanation:
Hint #11 / 3
All of the probabilities in a valid probability distribution must add up to 111.
Hint #22 / 3
Solve for the missing probability:
\begin{aligned} 0.475+\text{?}+0.090&=1 \\\\ 0.565+\text{?}&=1 \\\\ \text{?}&=0.435 \end{aligned}
0.475+?+0.090
0.565+?
?
=1
=1
=0.435
Hint #33 / 3
The answer:
P\left(Y=1\right)=0.435P(Y=1)=0.435
