Every year the state department of education gathers statistical information from all schools to award a letter grade showing the school’s academic performance. Each school is given a rating based on the median of the grades. A school principal used a bar graph to send his report. He assigned the horizontal axis to the student’s name and the vertical axis to the grades.

Why was this a mistake?

Question

Every year the state department of education gathers statistical information from all schools to award a letter grade showing the school’s academic performance. Each school is given a rating based on the median of the grades. A school principal used a bar graph to send his report. He assigned the horizontal axis to the student’s name and the vertical axis to the grades.

Why was this a mistake?

opcode · Answer

Hint:
|dw:1402696928327:dw|

Can you see the mistake now?

anonymous · Answer

I don't really get why it's a mistake like that

opcode · Answer

A school principal used a bar graph to send his report. He assigned the horizontal axis to the student’s name and the vertical axis to the grades. If the x-axis (the horizontal axis) is the students name and the y-axis (the vertical axis) are the grades. There has to be multiple bar-graphs per student. Otherwise the data would be incomplete.

anonymous · Answer

Okay I understand now, thanks

opcode · Answer

You cannot fit all of student's grades on one bar graph with a bunch of other students. It would be better if there was a circle (pie) graph.

They could get the mean faster for example plus fit all the data:
|dw:1402697651948:dw|

opcode · Answer

You are welcome. Glad you understand. :-)