A dealership has 5 red cars out of 20 cars. Based on his ratio, predict how many red cars the dealership would have if they had 100 cars.
A. 4
B. 25 *
C.400
D. 75
Which of the following is an example of independent events?
A. rolling two number cubes **
B. selecting marbles from a bag without replacement after each draw.
C. choosing and eating a piece of candy from a dish and then choosing another piece of candy.
D. pulling a card from a deck when other players have already pulled several cards from that deck.
correct
tysm
To predict how many red cars the dealership would have if they had 100 cars, you can use a proportion based on the ratio of red cars to total cars.
Step 1: Calculate the ratio of red cars to total cars.
The dealership has 5 red cars out of 20 cars. So, the ratio of red cars to total cars is 5/20.
Step 2: Set up a proportion with the given ratio and the unknown number of red cars out of 100 cars.
(5/20) = (x/100), where x represents the unknown number of red cars.
Step 3: Solve the proportion for x.
Cross-multiplying gives you:
20x = 5 * 100
20x = 500
x = 500/20
x = 25
Therefore, if the dealership had 100 cars, based on the given ratio, they would have 25 red cars.
Now, let's move on to the second question:
Independent events are events where the outcome of one event does not affect the outcome of the other events.
Among the options provided, the example of independent events is rolling two number cubes. Rolling a number cube does not impact the outcome of rolling another number cube. Thus, option A is the correct answer.