首先加减不影响标准差其次y=0.8x+20，注意前面的系数，也就是看做原来数列中的数字统统乘以0.8根号（0.8x-0.8x拔）^20.8提出到根号外，还是0.8，所以说标准差也是整体乘以0.8（不知道这样解释可以让大家明白嘛，好多符号打不出来）明白了，谢谢！！！！！谢谢谢谢呀记住：序列中每一个数都加上一个常数，标准差、方差保持不
For each student in a certain class, a teacher adjusted the student's test score using the formula y = 0.8x + 20, where x is the student's original test score and y is the student's adjusted test score. If the standard deviation of the original test
语法填空(文中加黑词汇为本单元的重点词汇)(共10小题;每小题2分,满分20分)High school life is not easy for each student, for you will meet a lot of 1.___ (challenge). Here are some tips for you to le a d 2.___happy an d meaningful life.There are various amazing resources in you...
**(6) F** **(7) E** **(8) C** **(9) A** **(6) 空格位于第一段末尾,是完整的一句话,应该填入一个能够独立成句的句子。** - 选项F是一个完整的句子,意思为“她每天上七节课”,符合语境,可以连接上下文。 **(7) 空格位于第二段末尾,前面提到这位老师两个月赚了五万元,空格处应该填入...
The plans below show a student accommodation building in 2010 and now. Summarise the information by selecting and reporting the main features, and make comparisons where relevant. Write at least 150 words. Task 1 地图 - - 范文 答题 Some people say that the fashion industry is bad for the ...
chat闲聊。由下文“Now I was paying the price﹣to write a five﹣page essay on “Why I Should Not Talk in Class”.(现在我在付出代价——就“我为什么不应该在班里说话”写一篇五页的文章)”和“I began with the reasons Ms Black would want to hear.”可知,布莱克老师想...
The federal FAFSA deadline is June 30 for each academic year, but college and state deadlines are often much sooner. Sarah Wood Jan. 14, 2025 How to Get Free Money as a Student From grants to scholarships to FAFSA, there are lots of ways to minimize your student debt. Jessica Walrack...
For each question, choose the correct answer.(1)A.A student has found the wrong ID card in his sports bag.B.The person who lost his bag can get it from the school office.C.If you find a lost sports bag, please take it to the school office.(2)A.Mrs Gray is not coming to the...
At the beginning of the school year, each student would be given a special job for the whole term. Rita, a quiet and hardworking girl, hoped for an exciting task, like taking care of the class plants. Instead, she received a small box with sand and a small ant. Even though the teac...
The federal FAFSA deadline is June 30 for each academic year, but college and state deadlines are often much sooner. Sarah WoodJan. 14, 2025 How to Get Free Money as a Student From grants to scholarships to FAFSA, there are lots of ways to minimize your student debt. ...