搜题请搜索小程序“爱下问搜题”
问题 选择题

一组数据共50个，分为6组，第1—4组的频数分别是5，7，8，10，第5组的频率是0.20，则第6组的频数是（   ）

A．10

B．11

C．12

D．15

答案

答案：A

首先根据频数=总数×频率，求得第五组频数；

再根据各组的频数和等于总数，求得第六组的频数：根据题意，得

第五组频数是50×0.2=10，

故第六组的频数是50-5-7-8-10-10=10．

故选A．

单项选择题

Which of the following statements is not true ？（）

A．Attribute sampling is the process of assessing whether results conform to specifications or no

B．Prevention means keeping errors out of the process by applying actions before the process starts changing its inpu

C．Variables sampling means that the result is classified into one of the 3 categories：“acceptable”-“acceptable after rework”“rejected”．

D．Inspection is often mainly done to keep errors out of the hands of the customer instead of as a means of process contro
查看答案
单项选择题

在护理烧伤病人时，护士应对烧伤创面评估，包括：（）

A.烧伤面积、深度、部位

B.渗出液的气味、量及性质

C.有无污染、感染

D.以上均正确
查看答案