數學題(平均數)

(66+218+142+128+131+90+221+79+148+89+225+68+67+234+75+134+84+238+137+146+220+74+227+140+231+135+224+139+88+212)
/ 30
= 4410/30
=147

2007-01-28 16:02:27 補充：
Example 112 6 15 3 12 6 21 15 18 12 ====================Casio MODE 2 SHIFT AC 12 M or RUN 6 M or RUN ... 12 M or RUN 1. The mean is... SHIFT 4 2. The sample standard deviation is... SHIFT 6 3. The sample variance is... SHIFT 6 x²

2007-01-28 16:02:52 補充：
Sharp MODE 3 2ndF ON/C 12 ) 6 ) ... 12 ) 1. The mean is... RCL 4 2. The sample standard deviation is... RCL 5 3. The sample variance is... RCL 5 x² ==================== 用番以上方法入番d數字就可以了

2007-01-28 16:03:31 補充：
http://ihome.ust.hk/~kailam/jenny/calculator.html

答案:147!

(66+218+142+128+131+90+221+79+148+89+225+68+67+234+75+134+84+238+137+146+220+74+227+140+231+135+224+139+88+212)除30=147

147,用計數機.

簡而精：＊１４７＊

66 218 142 128 131 90 221 79 148 89 225 68 67 234 75 134 84 238 137 146 220 74 227 140 231 135 224 139 88 212 既平均數係147