If the 5 scores have a mean of 8, then their total sum would be 8*5 = 40
Now if one score if added (let's call this score x), there are 6 scores and the mean changes to 9, thus:
(40 + x)/6 = 9
40 + x = 54
x = 14
She owes him $0.75 because if she paid him $1.50 already you just subtract that from $2.25
Answer:
10.5 miles
Step-by-step explanation:
You multiply the distance with the number of times he ran.
