1. If the average (arithmetic mean) of the five numbers x, 7, 2, 16, and 11 is equal to the median of the five numbers, what is the value of x? a. 7<x<11 b. x is the median of the five numbers 答案D. 我怎么选C?!!请好心NN讲讲这题我差哪儿。。。
2. On the number line shown below, is zero halfway beteween r and s? <------r---------s----t----------> a. s is to the right of zero. b. The distance between t and r is the same as the distance between t and -s. 答案是C。我选了B。。 请好心NN帮我指点指点。。。