Which weights more 2.48 or 2.5​

When only separate discreet points are graphed it is called?

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.

On the first of each month sasha runs a 5k race she keeps track of her times to track her progress her time in minutes is recorded in the table