SOLUTION: Maria averaged 212 miles on the first day of her trip. She averaged only 104 miles on the last six days of her trip. What was the overall average number of miles driven per day?
Algebra.Com
Question 340344: Maria averaged 212 miles on the first day of her trip. She averaged only 104 miles on the last six days of her trip. What was the overall average number of miles driven per day?
Answer by jrfrunner(365) (Show Source): You can put this solution on YOUR website!
the overall average is really a weighted average
--
weighted average = total miles driven/total days driven = (212+104)/7=45.14
==
alternatively, you could figure the miles each day and multiply by the proportion represented by each day.
--
for example, day 1 miles=212, day 2 miles =104/6=17.33, day 3 miles=17.33 etc
each day represents 1/7 of the trip.
--
weighted average= 212*(1/7)+17.33*(1/7)+...17.33*(1/7)=212*(1/7)+17.33*(6/7)=45.14
RELATED QUESTIONS
Maria averaged 212 miles on the first 3 days of her trip. she averaged only 104 miles on... (answered by edjones)
Because of traffic Maria could average only 40 km/h for the first 20% of her trip, but... (answered by checkley75)
On the first part of a 363-mile trip, Emily averaged 58 miles per hour. Due to increased... (answered by nerdybill)
On a 135 mile bicycle excursion, Maria averaged 5 miles per hour slower during the last... (answered by solver91311)
please help with this problem:
On a bicycle trip,Maria averaged 5 miles per hour faster (answered by adamchapman)
Maria drove to her grandmother’s house at an average speed of 60 miles per hour. On the... (answered by Fombitz)
on a trip jennifer noticed that her car averaged 21 mi/gal of gas except for the days she (answered by ikleyn)
On a 135-mile bycycle excursion, Maria averaged 5 mph faster for the first 60 miles than... (answered by Mathtut)
Maria drove to her grandmother’s house at an average speed of 60 miles per hour. On the... (answered by pakhi)