Posted by & filed under driver.

Control Panel – Programs and Features – Turn Windows features on and off and enabled:
SMB 1.0/CIFS File Sharing Support
Restarted and everything worked.

Add-Remove Programs client method

https://docs.microsoft.com/en-us/windows-server/storage/file-server/troubleshoot/detect-enable-and-disable-smbv1-v2-v3…

Posted by & filed under Access.

Text Functions, Workbook
Before continuing please be aware of the following information available in Excel HELP

FIND(find_text,within_text,start_num)
Worksheet Description VBA
CHAR Returns the character specified by the code number CHR
CLEAN Removes all nonprintable characters from text
Characters 0-31, 129, …

Posted by & filed under DATABASE.

标准差

标准差是数值分散的测量。

标准差的符号是 σ (希腊语字母 西格马,英语 sigma)

公式很简单:方差平方根。那么…… “方差是什么?”

方差

方差的定义是:

离平均的平方距离的平均。

按照以下的步骤来计算方差:

例子

你和朋友们量度了狗狗的身高(毫米):
狗图肩高

身高(到肩膀)是:600mm、470mm、170mm、430mm 和 300mm。

求平均、方差和标准差。

第一步是求平均:

答案:

平均  =  600 + 470