R= {3,4,7,9} T= {2,5,8} If a number r is to be chosen from set R and a number t is to be chosen from set T, what is the ranges o

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问题 R= {3,4,7,9}
T= {2,5,8}
If a number r is to be chosen from set R and a number t is to be chosen from set T, what is the ranges of all possible values of t/r

选项 A、2/9
B、13/9
C、22/9
D、11/3
E、14/3

答案C

解析 极差中只需找出最大值和最小值。最大值:分子最大,分母最小,为8/3。最小值:分子最小,分母最大,为2/9。其差为22/9,故答案为C。
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