A test 3

A test of five light bulbs showed that they burned for the following lengths of time (in days): 17 2/3, 19 1/4, 20 1/2, 21, and 18 3/4. For how many days, on average, did the light bulbs burn?

Correct answer:

m =  19 1330 = 583/30 h

Step-by-step explanation:

a=1732=17+32=317 3+2=351+2=35317.6667 h b=1941=19+41=419 4+1=476+1=477=19.25 h c=2021=20+21=220 2+1=240+1=241=20.5 h d=21 h e=1843=18+43=418 4+3=472+3=475=18.75 h  s=a+b+c+d+e=353+477+241+21+475=658397.1667 h  m=5s=56583=30583 h=193013 h=19.4333 h

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