There are 280 students in the elementary school and 30% of them ate a sandwich for lunch. How many students ate a sandwich for lunch? A. 74B. 84C. 112D. 250

84 students (C)

Step-by-step explanation:

Since 30% of the students ate a sandwich and there is 280 students in total, then you can just do 280 x 0.30 = 84. That means the answer is C, 84 students.

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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.