Q on median and IQR from cul freq curve.

[Sonal7]

I am confused why the median is when =320. clearly this must be a mistake right? I think 300 is halfway between 0 and 600.

 

[Dr.Peterson]

That looks like a typo to me, since the next line uses 300, not 320.

 

[Sonal7]

that makes sense, and why is the Q1 =150-80/40. I got where 150 come from is a 1/4 of the value up from min to max.

 

[Dr.Peterson]

that makes sense, and why is the Q1 =150-80/40. I got where 150 come from is a 1/4 of the value up from min to max.

What don't you understand about Q1? They are solving 40x + 80 = 150.

 

[Sonal7]

This is a hard question to get my head around, so the value of x when y =Q1,Q3 etc. Thank you very much.