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单项选择题
A number x is chosen at random from the set of positive integers less than 10. What is the probability that
单项选择题
Jordan has taken 5 math tests so far this semester. If he gets a 70 on his next test, it will lower the average (arithmetic mean) of his test scores by 4 points. What is his average now
(A) 74
(B) 85
(C) 86
(D) 90
(E) 94
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