A class of 30 students studies both Mathematics and Economics . Sue was absent on the day of the Mathematics and Economics exams. Here are the marks for the other 29 students for each subject.
Mathematics
51 50 69 66 72 68 83 88 76 55
54 74 57 62 75 81 92 49 59 83
83 65 53 61 79 66 45 88 67
Economics
43 75 56 54 69 68 78 80 54 73
88 53 67 67 80 59 61 94 72 51
54 57 75 59 60 55 76 45 78
(Urgent)一條英文Maths standard deviation題目20分呀!!
2007-05-21 7:29 am
回答 (2)
2007-05-22 6:08 pm
✔ 最佳答案
a. mean for Maths: 67.9655, standard deviation for Maths: 13.0053mean for Econ: 65.5517, standard deviation for Maths: 12.5412
b. From normal distribution table, 0.7 standard deviation is equal to 0.258. And so Sue's assessment for Maths = 67.9655 + 13.0053 * 0.7 = 77.0692
And 1.1 standard deviation is equal to 0.3643. And so Sue's assessment for Econ = 65.5517 + 12.5412 * 1.1 = 79.3470
c. Sue got higher mark in Econ.
2007-05-21 8:26 pm
Mathematics
將全部數學分加埋除30
1971/30=65.7
Economics
將全部經濟科分加埋除30
1901/30=63.6666
=63.67
將65.7-63.67=2.03
答案 =2.03
將全部數學分加埋除30
1971/30=65.7
Economics
將全部經濟科分加埋除30
1901/30=63.6666
=63.67
將65.7-63.67=2.03
答案 =2.03
收錄日期: 2021-04-18 22:13:09
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070520000051KK06216