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profits can be eitehr -(24*20) or (450*10-24*200
.264 .736=(4020*.736)+(-480*.264)=2832
thankyou soooooooooooooooooooooooooooooooooooooooooooooo much
not a problemthankyou soooooooooooooooooooooooooooooooooooooooooooooo much
ohhh, makes sense. Thanks!profits can be eitehr -(24*20) or (450*10-24*200
which are -480 or 4020
its -480 if more than 1 firework fails to work since they get no revenue and only have the cost. From the prev question you found out the prob for failure of more than 1 firework to be 0.264
its 4020 profit when less than 1 firework fails to work since they get the revenue..In this situation the prob is (1-.2640
y -480 4020
p
do the E
okei !! this seems more correct .. thanks for correcting me
within 12g means
20+12 and 20-12
so P( 8< 32 ) = 0.94
now standardize this and solve
i tried it that way, doesnt match, the examiners report says to use 0.97 as the probability :Swithin 12g means
20+12 and 20-12
so P( 8< 32 ) = 0.94
now standardize this and solve
I'm not sure if your problem has already been addressed, but your question is too interesting to resist" The masses of articles produced in a particular workshop are normally distributed with mean 51.3 g and standard deviation 20.5 g. Find the symmetrical limits, about the mean, within which 75% of the masses lie."
someone PLEASE explain!
[ans: a=27.7 , b=74.9]
So here goes..
hey! Can you tell me y did u take Z as negative ? it could have been positive also ?
could u please help me out with this one? it seems kinda odd http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w11_qp_61.pdf no.5 iI'm not sure if your problem has already been addressed, but your question is too interesting to resist
Symmetrical limits means that both the values, let them be x and y are the same distance from the mean. That means x-mean and y-mean are the same but with opposite signs. like for 3 and 1c about 2.. 3-2=1 and 1-2=-1
So P(x< X < y) = .75
P[(x-51.3)/20.5< X < (y-51.3)/20.5] = .75
this brings us to
P(-a< Z <a) = .75
2*Fi(a)-1= .75
Fi(a) = .875
so a is approximately 1.152
(x-51.3)/20.5= 1.152 and x=74.9
(y-51.3)/20.5= -1.152 and y=27.7
What exactly troubles you in this q? Its simple
It IS .97.. but later on..
There really isn't any clue ! Its just how u solve a question !
All the best man ! May Allah be with you ! And all of us !!Hey guys good luck.for stats today..I hope we all can tackle it easily n get good marks...all the best
check this
i am sorry , just saw ur post.. ok if for example 2<x<7 then class boundry is 1.5<x<7.5... just simply sub 0.5 from lower one and add 0.5 to upper one .. got it?
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