首页
登录
职称英语
Of the 40 specimens of bacteria in a dish, 3 specimens have a certain trait. If
Of the 40 specimens of bacteria in a dish, 3 specimens have a certain trait. If
游客
2024-01-12
32
管理
问题
Of the 40 specimens of bacteria in a dish, 3 specimens have a certain trait. If 5 specimens are to be selected from the dish at random and without replacement, which of the following represents the probability that only 1 of the 5 specimens selected will have the trait?
选项
A、
B、
C、
D、
E、
答案
E
解析
In the context of this problem,
represents the number of ways r specimens can be selected without replacement from n specimens.
The probability that only 1 of the 5 specimens selected from the 40 specimens will have the trait is equal to
number of ways to select 5 specimens, only 1 of which has the trait
number of ways to select 5 specimens
The number of ways 5 specimens can be selected from the 40 specimens is
. To select 5 specimens, only 1 of which has the trait, you have to select 1 of the 3 specimens that have the trait and select 4 of the 37 specimens that do not have the trait. The number of such selections is the product
.So the probability that only 1 of the 5 specimens selected will have the trait is represented by
. The correct answer is Choice E.
This explanation uses the following strategies.
Strategy 1: Translate from Words to an Arithmetic or Algebraic Representation
Strategy 8: Search for a Mathematical Relationship
转载请注明原文地址:https://tihaiku.com/zcyy/3355654.html
相关试题推荐
Ourpreferencesforcertaincolorsare______accordingtothepassage.[br]Whi
Ourpreferencesforcertaincolorsare______accordingtothepassage.[br]Whi
Thedegree______youmaintainyourmentalhealthmaydependoncertainsimpleenv
Inasecond-handbookshop,Billycameacrossabookwhichhethoughtwascertain
Overuseofantibioticscanleadtodrug-resistantbacteriathathavetobetr
WINK,Inc.followsacertainprocedurethatrequirestwotaskstobefinishedin
Inacertainconservativemutualfund,70percentofthemoneyisinvestedinbo
Acertainlabexperimentswithwhiteandbrownmiceonly.Inoneexperiment,2/3
Inacertaingrowthfund,3/5oftheinvestmentcapitalisinvestedinstocks,a
Acertaintruckuses18gallonsofdieselfuelintraveling270miles.Inorder
随机试题
Youshouldspendabout20minutesonQuestions27-40whicharebasedonReading
Language-basedlearningdisabilitiesareproblemswithage-appropriateread
为了使音乐的表现力更形象具体,柏辽兹在其交响曲中,用一个特定的旋律代表具体人物,
A.组织面、磨光面、咬合面 B.组织面 C.磨光面、咬合面 D.磨光面
诊断原发性甲状腺功能减退最敏感的试验是()A.血清促甲状腺激素(TSH)测
哪项措施用于肝硬化食管静脉破裂出血治疗是错误的A.吗啡镇静 B.输新鲜血 C
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
皮肤出现红色皮疹,抚之碍手,压之褪色,可见于( )。A.热气疮 B.疔疮
双趋冲突是心理冲突的一种,指个体必须对同时出现的两个具有同等吸引力的目标进行选择
项目决策阶段的管理策划的工作内容包括( )A.项目实施期管理总体方案 B.生
最新回复
(
0
)