Final Answer:
If you rank in the 3rd quartile of 1000 students, there are 250 students ranked above you. Hence, option A) 250 is the correct choice.
Step-by-step explanation:
Quartiles divide a dataset into four equal parts, with each quartile representing 25% of the data. The third quartile (Q3) encompasses the upper 25% to 50% of the dataset. If there are 1000 students, the third quartile includes students ranked from 751 to 1000.
If you rank in the 3rd quartile, it means 750 students are ranked below you (25% of 1000). As there are 1000 total students, subtracting the students in the 3rd quartile (750) from the total (1000) gives the number of students ranked above you, which is 1000 - 750 = 250.
Therefore, in a dataset of 1000 students, if you are in the 3rd quartile, 250 students rank above you. This calculation is based on the understanding that quartiles divide data into four equal parts, and being in the 3rd quartile means 75% of the students are ranked below you, leaving 25% (250 students) ranked above. OPTION A