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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?
 9 months ago
 9 months ago
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?
 9 months ago
 9 months ago

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cnu115Best ResponseYou've already chosen the best response.0
standard deviation of 10
 9 months ago

dan815Best 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
 9 months ago

dan815Best ResponseYou've already chosen the best response.0
look up the probability distribution graph numbers
 9 months ago

cnu115Best ResponseYou've already chosen the best response.0
Sorry sir, I could not follow you. Could you please explain
 9 months ago

dan815Best 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
 9 months ago

cnu115Best ResponseYou've already chosen the best response.0
Is it 21% with 0.8 standard deviation?
 9 months ago

cnu115Best 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
 9 months ago

dan815Best ResponseYou've already chosen the best response.0
how much more deviation does she have to go to cover upto 75%
 9 months ago

dan815Best ResponseYou've already chosen the best response.0
look at that chart and figure it out
 9 months ago

dan815Best ResponseYou've already chosen the best response.0
its somewhre inbetween 0.5 and 1
 9 months ago

dan815Best ResponseYou've already chosen the best response.0
so 0.75 of 10 = ? 7.5 marks
 9 months ago

dan815Best ResponseYou've already chosen the best response.0
then 87.5 should be the marks she needs to set it at
 9 months ago

dan815Best 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
 9 months ago

cnu115Best ResponseYou've already chosen the best response.0
This Z values I am not aware sir. I am just browsing about this
 9 months ago

dan815Best ResponseYou've already chosen the best response.0
this will give u more accurate vlaue
 9 months ago

cnu115Best ResponseYou've already chosen the best response.0
what is this equation you have used
 9 months ago

dan815Best ResponseYou've already chosen the best response.0
at 0.5 deviation on right how much percent have you covered?
 9 months ago

cnu115Best ResponseYou've already chosen the best response.0
and how did you get 0.37
 9 months ago

dan815Best ResponseYou've already chosen the best response.0
do you know the answer already
 9 months ago

dan815Best ResponseYou've already chosen the best response.0
whats the answer supposed to be
 9 months ago

dan815Best ResponseYou've already chosen the best response.0
i cant help you if u arent answering my questions
 9 months ago

cnu115Best ResponseYou've already chosen the best response.0
No. Idon't know the answer
 9 months ago

dan815Best ResponseYou've already chosen the best response.0
then dont bother with stuff
 9 months ago

dan815Best ResponseYou've already chosen the best response.0
first understand the graph
 9 months ago

cnu115Best ResponseYou've already chosen the best response.0
I want to know more about this Z score
 9 months ago

dan815Best ResponseYou've already chosen the best response.0
the graph is pretty self explanatory and questions about it?
 9 months ago

cnu115Best ResponseYou've already chosen the best response.0
Now it is clear. But one question. May I ask
 9 months ago

cnu115Best ResponseYou've already chosen the best response.0
Why did you divide by 15. It is only 14 parts. Right
 9 months ago

cnu115Best ResponseYou've already chosen the best response.0
Sorry. Now I have fully understood.
 9 months ago

cnu115Best ResponseYou've already chosen the best response.0
It is not the 14 parts. It is the area of that part.
 9 months ago

cnu115Best ResponseYou've already chosen the best response.0
Thank you very much explaining in detailed manner
 9 months ago

cnu115Best ResponseYou've already chosen the best response.0
Thanks for your patience and analysing for a lehman.
 9 months ago

MusadiqBest ResponseYou've already chosen the best response.0
Mean 80 standard deviation 10 z=0.67 X=73.3
 9 months ago

MusadiqBest ResponseYou've already chosen the best response.0
mine answer is 73.3 marks min to get A
 9 months ago

MusadiqBest ResponseYou've already chosen the best response.0
you have to take Z value 0.67
 9 months ago

dan815Best ResponseYou've already chosen the best response.0
musadiq no try taking 0.67 Z
 9 months ago

MusadiqBest ResponseYou've already chosen the best response.0
well table value is 0.67 that's lies at left side !
 9 months ago
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