The box plots below show the lifespan, in months, of laptop batteries manufactured by four companies:

box plot labeled company a shows minimum at 19, first quartile at 19.5, median at 23, third quartile at 23.5, and maximum at 24. company b shows minimum at 21, first quartile at 22, median at 24, third quartile at 25, and maximum at 26. company c shows minimum at 20, first quartile at 21, median at 22, third quartile at 24, and maximum at 28. company d shows minimum at 19, first quartile at 20, median at 22.5, third quartile at 23.5, and maximum at 27.

based on the data, which company manufactures batteries having the greatest variation in lifespan?

company a
company b
company c
company d

I see 2 answers here. Company C and D at 8 months... (Companies A and B at 5 months)

Explanation:

I took the Maximum and subtracted it by the Minimum.

Ex. Company D: 27 (Max) - 19 (Min) = 8 months

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.