Megan is checking her tax bill for the last year. The tax rates were as follows:
No tax on the first £11000 of earnings
Earnings in excess of £11000 and up to £43,000 taxed at a rate of 20 percent.
Earnings in excess of £43000 and up to £150000 taxed at a rate of 45 percent
Last year Megan earned £158900 before tax.
How much did she pay?

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.