1. (Tutor) Jane\'s five test scores are 80,75, 75, 80,80. What is her average? S
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1. (Tutor) Jane's five test scores are 80,75, 75, 80,80. What is her average? Solution 1: We simply add five test scores and divide by the total number of tests, that is, (80+75+75+80+80)/5-78 Solution 2: Look at the scores. 80 appears three times and 75 appears twice, so we can simply find the total sum by 3*80+2*75 390. So her average is 390/5-78. 2. Liz recently took a road trip. She bought 30 gallons of gasoline for $3.18 per gallon and 10 gallons at a price of $3.75 per gallon. She filled her tank once on the way back with 20 gallons at $3.65 per gallon. What was the average cost of fuel, per gallon, on her trip? 3. For the first four hours on his delivery route, a trucker drove at an average of 40 mph. For the next 6 hours, which completed his route, he averaged 55mph. What is the average speed for the whole trip?Explanation / Answer
2) 3.18$ per gallon ----- 30 gallons = 3.18*30 = $ 95.4
3.75 $ per gallon ------ 10 gallons = 3.75*10 = $ 37.5
3.65$ ------ 20 gallons = 3.65*20 = $73
Total expense of fuel = 95.4 +37.5 + 73 = $205.9
Fuel cost per gallon = 205.9/(30+10+20) = $ 3.43
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