The total * * * population is 2+3+6+14+15+5+4+1= 50.

50/2=25 is the average median of the 25th and 26th students. No.25 student 80, No.26 student 90

So the median =(80+90)/2=85.

Average value = (50 * 2+60 * 3+70 * 6+80 *14+90 *15+100 * 5+10 * 4+/kloc.