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→ redpikmin:謝謝阿昌~~^^ 推 218.160.17.191 10/21
呼呼~~我是阿昌
這是我寫的答案~~如果有錯誤還請大家多批評.....
(a)平均數
(22+25+28+31+34+35+39+39+40+42+44+44+46+48+49+51+53+53+55+55+56+57+59+60+
61+63+63+63+65+66+68+68+69+71+72+72+74+75+75+76+78+78+80+82+83+85+88+90+
92+96)/50
=3018/50 =60.36
標準差 (下面"這個符號表示平方~我不會打平方>"<)
[(22-60.36)"+(25-60.36)"+(28-60.36)"+(31-60.36)"+(34-60.36)"+(35-60.36)"+
(39-60.36)"+(39-60.36)"+(40-60.36)"+(42-60.36)"+(44-60.36)"+(44-60.36)"+
(46-60.36)"+(48-60.36)"+(49-60.36)"+(51-60.36)"+(53-60.36)"+(53-60.36)"+
(55-60.36)"+(55-60.36)"+(56-60.36)"+(57-60.36)"+(59-60.36)"+(60-60.36)"+
(61-60.36)"+(63-60.36)"+(63+60.36)"+(63-60.36)"+(65-60.36)"+(66-60.36)"+
(68-60.36)"+(68-60.36)"+(69-60.36)"+(71-60.36)"+(72-60.36)"+(72-60.36)"+
(74-60.36)"+(75-60.36)"+(75-60.36)"+(76-60.36)"+(78-60.36)"+(78-60.36)"+
(80-60.36)"+(82-60.36)"+(83-60.36)"+(85-60.36)"+(88-60.36)"+(90-60.36)"+
(92-60.36)"+(96-60.36)"]/50
=16961.52/50 = 339.2304
339.2304 開根號 約=18.419
(b)中位數
(61+63)/2=62
Q1
50/4=12.5 取13 Q1=46
Q3
3*50/4=37.5 取38 Q3=75
(c)P35
35/100*50=17.5 取18 P35=53
P40
40/100*50=20 取20,21 (55+56)/2=55.5
(d)假設那個同學的百分為數是Px
x/100*50=45 所以x=90 答案是P90
呼好累~~如果我有算錯的地方請大家幫我更改~還有小心別眼花~讓眼睛多休息~
希望有幫到大家......
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