(1)The range of the five numbers is 2 or more;
(2)AT least one of x,y,z is more than 9;
【答案】12
【思路】因为mean=8, so x+y+z=28, 那么x,y,z最接近只能为8,9,11 so range2.中强调range=2包括2所以认为对.
由x+y+z=28可知, x,y,z平均数9所以正确.
19、If for integers C, 6
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