1/2 of a group of chickens tried to cross the road. only 3/4 of those chickens made it to the other side. what fraction of the original group of chickens made it to the other side?

of the group

Step-by-step explanation:

of a group of chickens tried to cross the road.

only of those chickens made it to the other side.

So   ×

=  of the group of chickens made it to the other side.

452,489 to the nearest thousand is 452,000

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.