5. how many six-character codes are possible if the
first three characters are numerical and the last
three characters are letters? repetition of letters
and numbers is allowed.
a. 11,232,000 c. 15,600,000
b. 12,654,720 d. 17,576,000

-18

step-by-step explanation:

because mean value defines that total sum value over total number of set

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.