Felipe is participating in a 5-day cross- country biking challenge. he biked for 64, 55, 68, and 69 miles on the first four days. how many miles does he need to bike on the last day so that his average (mean) is 62 miles per day?
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64+55+68+69+x /5 =62
x=310-256 = 54
so he need to bike 54 miles more so that his average (mean) is 62 miles per day
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