find out the mean and median

Question

0-10,10-20,20-30,30-40,40-50,50-60,60-70,70-80
5 ,10 , 20 ,40 ,30 ,20 ,10 , 4

Answer 1

What do the hyphenated numbers represent?

Using the second line of numbers:

4+5+10+10+20+20+30+40=139

Mean = 139/8 = 17.375

Mode is the numbers that occur most often = 10 and 20