Suppose you want to show the data in a circle graph. find the measure of the central angle for 7th grade. round your answer to the nearest degree, if necessary.
grade number of students
4th 45
5th 25
6th 60
7th 50
8th 60
9th 45

The sum of angle in a circle = 360 degree

The total grade number of students = 45+25+60+50+60+45 = 285

The measure of the central angle for each student = (360/285) x 1 = 1.26 degree

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.