 ; R& l5 |3 j/ |: L) ^
1.The median score for the class is
& d' {+ k8 l# T. E. K; [% M A.76
! d0 e3 ^5 R: A' B$ c B.77
( f( f/ }: D7 x% ?) g C.78
9 j7 v. K' T- V/ p; U D.79
0 m. e: { D, P% E4 k2 j# X# | E.80. V9 D8 u6 H( O, d7 j
答案：B
1 N$ B! E/ z% E 2.If 5 points were added to each score, which of the following would not be affected?
/ t* M) G& w/ `) M( T9 ? A.The highest score
; ~% c4 H4 D) L0 T& O1 ?5 M B.The mean for all scores0 h5 n+ a: B/ n& ~5 Y* I
C.The median for the seniors'scores
/ t6 ?! p+ {7 ?0 \ D.The mode for the juniors' scores) C* [6 u$ N/ i* @
E.The standard deviation for all scores/ H8 l6 t4 s, O, @( H+ Y
答案：E$ T9 _' X) V3 m
3.If the mean score for the juniors were known, which of the following could be calculated from the information given?
, H8 ]% M% a4 e1 N (1) The range of the scores for the seniors
( s% V/ a' u! b (2) The median score for the juniors
6 U; D+ l2 C. | z (3) The mean score for the seniors0 J/ }& y& I, `7 E t: l8 l; K
A.None
. S# J& Y+ w, m) a% I: M B.(1) only
K/ x6 }/ L0 q5 @ C.(3) only( H" j" d K8 y4 U* G3 m% V- P
D.(1) and (2)- P- O$ W4 W, z
E.(2) and (3)2 ~$ a9 j1 Y9 C0 n ^, S
答案：C |
发表于 2012-8-15 12:55:17
