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cnu115
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On an exam, a class ended with a mean raw score of 80 with standard deviation of 10. The distribution of grades in the class was approximately normal. If the teacher wants to give "A" to the top 25th percentile (top 25%) of the class, what is the lowest raw score we could get and still get an "A" on the exam?
 one year ago
 one year ago
cnu115 Group Title
On an exam, a class ended with a mean raw score of 80 with standard deviation of 10. The distribution of grades in the class was approximately normal. If the teacher wants to give "A" to the top 25th percentile (top 25%) of the class, what is the lowest raw score we could get and still get an "A" on the exam?
 one year ago
 one year ago

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dan815 Group TitleBest ResponseYou've already chosen the best response.0
dw:1373527655365:dw
 one year ago

cnu115 Group TitleBest ResponseYou've already chosen the best response.0
standard deviation of 10
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
lol i mean how many deviation points wud u have to travel, to be left with only 25% area on the right side
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
look up the probability distribution graph numbers
 one year ago

cnu115 Group TitleBest ResponseYou've already chosen the best response.0
Sorry sir, I could not follow you. Could you please explain
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
look at that and see at what standard deviation you have to be to be left with only 25% area on the right side
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
dw:1373530622874:dw
 one year ago

cnu115 Group TitleBest ResponseYou've already chosen the best response.0
Is it 21% with 0.8 standard deviation?
 one year ago

cnu115 Group TitleBest ResponseYou've already chosen the best response.0
It is only one standard deviation point above the mean is to be covered. Isn't it? Other please explain
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
dw:1373533594767:dw
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
how much more deviation does she have to go to cover upto 75%
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
look at that chart and figure it out
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
dw:1373533703309:dw
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
its somewhre inbetween 0.5 and 1
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
id say around 0.75
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
so 0.75 of 10 = ? 7.5 marks
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
then 87.5 should be the marks she needs to set it at
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
im just estimating values here, im sure u got some formulas to calculate the exact z values and stuff
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
dw:1373533813410:dw
 one year ago

cnu115 Group TitleBest ResponseYou've already chosen the best response.0
This Z values I am not aware sir. I am just browsing about this
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
this will give u more accurate vlaue
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
dw:1373533861018:dw
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
dw:1373533886859:dw
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
dw:1373533895795:dw
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
dw:1373533946389:dw
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
dw:1373533966949:dw
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
dw:1373533987799:dw
 one year ago

cnu115 Group TitleBest ResponseYou've already chosen the best response.0
dw:1373534025223:dw
 one year ago

cnu115 Group TitleBest ResponseYou've already chosen the best response.0
what is this equation you have used
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
look at the chart
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
at 0.5 deviation on right how much percent have you covered?
 one year ago

cnu115 Group TitleBest ResponseYou've already chosen the best response.0
and how did you get 0.37
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
do you know the answer already
 one year ago

cnu115 Group TitleBest ResponseYou've already chosen the best response.0
????? 5*6/15=0.37 ????
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
whats the answer supposed to be
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
its 5.6 not 5 * 6
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
i cant help you if u arent answering my questions
 one year ago

cnu115 Group TitleBest ResponseYou've already chosen the best response.0
No. Idon't know the answer
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
then dont bother with stuff
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
first understand the graph
 one year ago

cnu115 Group TitleBest ResponseYou've already chosen the best response.0
I want to know more about this Z score
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
the graph is pretty self explanatory and questions about it?
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
any questions?
 one year ago

cnu115 Group TitleBest ResponseYou've already chosen the best response.0
just a second sir,
 one year ago

cnu115 Group TitleBest ResponseYou've already chosen the best response.0
Now it is clear. But one question. May I ask
 one year ago

cnu115 Group TitleBest ResponseYou've already chosen the best response.0
Why did you divide by 15. It is only 14 parts. Right
 one year ago

cnu115 Group TitleBest ResponseYou've already chosen the best response.0
Sorry. Now I have fully understood.
 one year ago

cnu115 Group TitleBest ResponseYou've already chosen the best response.0
It is not the 14 parts. It is the area of that part.
 one year ago

cnu115 Group TitleBest ResponseYou've already chosen the best response.0
Thank you very much explaining in detailed manner
 one year ago

cnu115 Group TitleBest ResponseYou've already chosen the best response.0
Thanks for your patience and analysing for a lehman.
 one year ago

Musadiq Group TitleBest ResponseYou've already chosen the best response.0
Mean 80 standard deviation 10 z=0.67 X=73.3
 one year ago

Musadiq Group TitleBest ResponseYou've already chosen the best response.0
mine answer is 73.3 marks min to get A
 one year ago

Musadiq Group TitleBest ResponseYou've already chosen the best response.0
you have to take Z value 0.67
 one year ago

dan815 Group TitleBest ResponseYou've already chosen the best response.0
musadiq no try taking 0.67 Z
 one year ago

Musadiq Group TitleBest ResponseYou've already chosen the best response.0
well table value is 0.67 that's lies at left side !
 one year ago
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