A box contains 8 lightbulbs of which 3 are defective.A bulb is selected from the box and tested.If it is defective,another bulb is selected and tested,until a nondefective bulb is chosen.Find the expected number E of bulbs chosen.

统计学 概率Consider 3 boxes.The first box contains 1 white and 2 black balls,the second box contains 2 white and 4 black,and thethird box contains 6 white and 3 black.Toss a fair die and randomly choose a ball- from the first box if you roll a 1 The boy took out a red box that____a lot of broken toys.A、contains B、collects C、putsD、includes.为什么 A box contains 8 lightbulbs of which 3 are defective.A bulb is selected from the box and tested.If it is defective,another bulb is selected and tested,until a nondefective bulb is chosen.Find the expected number E of bulbs chosen. 数学问题概率求解释Rework problem 28 from section 3.4 of your text, involving the drawing of twoballs from a box of colored balls. Assume the box contains 8 balls:3 red, 3 blue, and 2 yellow. A ball is drawn and its color noted. If the bal 不用写出过程,只要写一下每一题的答案和大概怎么做的就行了,感激不尽10.A box contains 6 white marbles,7 red marbles,and 8 blue marbles.(a) If you choose 3 marbles at random from the box,what is the probability that they are 一道英文数学概率题A box contains 4 black cubes and 6 white cubes.A cube is drawn from the box.Its colour noted and a cube of the other colour is then added to the box.A second cube is then drawn.(a).If both cubes are of the same colour,what 一道关与期望值的数学题A box contains 3 red and 5 green marbles.If 3 marbles are drawn without replacement,what is the expected number of red marbles?一个盒子里有8个球,三个为红色5个为绿色.如果从中不放回地取出3个 懂计算机图形学的进 2,OpenGL can be viewed as a state machine,a black box that contains a finite state machine.Explain what is a state machine. 英语翻译Confortable:extactible container thanks to a practicalrelease system.The electric box contains the on-off buttons,hours counter and vacuum gauge.The two big rear casters,with brakes and Vulkolan tyres,allow an easy manoeuvrabilityof the v 一道英文统计题a box contains 10 tickets.each ticket is marked with a whole number between -5 and 5.The numbers are not all the same;their average equals 0.(a) 100 draws are made from the box,and you win $1 if the sum is between -15 and 15(B) 1 一道关于概率的英文数学题7) A box contains 3 red,4 white and 5 blue discs.Three discs are selected at randomfrom the box.Find the probability that:a) all three discs are the same colour,if the selection is with replacement b) all three dis Draw a green box under the box GMAT数学一题,求清晰解题思路并分析本人的解法对错,A box contains 100 balls,numbered from 1 to 100.If three balls are selected at random and with replacement from the box,what is the probability that the sum of the three numbers on a box of a box-office smash There are 8 boxes on the table.There are red balls or blue balls ,and each box contains different number of balls.They are 7,10,13,18,28,31,46,62.Suppose you don't know the colors and the numbers of the balls .Now you take away 1 box,and the red ball This big box only_some books,somechildren books_ Acontain included Bcontain,containCincludedThis big box only_some books,somechildren books_ Acontain included Bcontain,contain Cincluded,included D contains included This new book _____________20 articles ,_________five written by my sister.A.contains ,includes B.includes,contains c.contains,including D.includes,contained选什么,为什么?