0-4, 5-9, 10-14, 15-19, 20-24

create a frequency distribution

the common difference is 4

Step-by-step explanation:

we can normally find out that the difference between the first item and the second  item is 4

and the difference between the third item and fourth item is 4

gaddgad

step-by-step explanation:

3.4 pizzas

step-by-step explanation:

given is a scatter plot showing number of pizzas sold during weeks for different issues of coupon

y represents number of pizzas sold and x number of coupons issued

y is marked verticaly and x horizontally

the trend line is given as

y =3.4x+43

this says that even when no coupon is issued pizzas sold will be 43

and rate of change of pizza sold for 1 unit of coupon = slope = 3.4

i.e. when x increases by 1 unit y increases by 3.4 units

hence for each additional coupon issued 3.4 pizzas more will be sold