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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?

Probability
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|dw:1373527655365:dw|
standard deviation of 10
lol i mean how many deviation points wud u have to travel, to be left with only 25% area on the right side

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Other answers:

look up the probability distribution graph numbers
Sorry sir, I could not follow you. Could you please explain
https://www.google.ca/search?gs_rn=17&gs_ri=psy-ab&tok=tEH_WKdK4z3EM3ono5y2dg&pq=probability+distribution&cp=27&gs_id=35&xhr=t&q=probability+distribution+chart&bav=on.2,or.r_qf.&bvm=bv.48705608,d.aWc&biw=1280&bih=897&um=1&ie=UTF-8&hl=en&tbm=isch&source=og&sa=N&tab=wi&ei=2GneUbvnMYWTyAH8HA#facrc=_&imgdii=_&imgrc=N1qZOwVnVPP-9M%3A%3B1jQwC4INkQn0OM%3Bhttp%253A%252F%252Fmathbits.com%252FMathBits%252FTISection%252FStatistics2%252FlabeledChart2.jpg%3Bhttp%253A%252F%252Fmathbits.com%252FMathBits%252FTISection%252FStatistics2%252Fnormaldistribution.htm%3B721%3B381
look at that and see at what standard deviation you have to be to be left with only 25% area on the right side
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Is it 21% with 0.8 standard deviation?
It is only one standard deviation point above the mean is to be covered. Isn't it? Other please explain
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how much more deviation does she have to go to cover upto 75%
look at that chart and figure it out
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its somewhre inbetween 0.5 and 1
id say around 0.75
so 0.75 of 10 = ? 7.5 marks
then 87.5 should be the marks she needs to set it at
im just estimating values here, im sure u got some formulas to calculate the exact z values and stuff
|dw:1373533813410:dw|
This Z values I am not aware sir. I am just browsing about this
this will give u more accurate vlaue
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what is this equation you have used
5.6/15
because
look at the chart
at 0.5 deviation on right how much percent have you covered?
and how did you get 0.37
do you know the answer already
????? 5*6/15=0.37 ????
whats the answer supposed to be
its 5.6 not 5 * 6
i cant help you if u arent answering my questions
No. Idon't know the answer
then dont bother with stuff
first understand the graph
I want to know more about this Z score
Ok sir
https://www.google.ca/search?gs_rn=17&gs_ri=psy-ab&tok=tEH_WKdK4z3EM3ono5y2dg&pq=probability+distribution&cp=27&gs_id=35&xhr=t&q=probability+distribution+chart&bav=on.2,or.r_qf.&bvm=bv.48705608,d.aWc&biw=1280&bih=897&um=1&ie=UTF-8&hl=en&tbm=isch&source=og&sa=N&tab=wi&ei=2GneUbvnMYWTyAH8HA#facrc=_&imgdii=_&imgrc=N1qZOwVnVPP-9M%3A%3B1jQwC4INkQn0OM%3Bhttp%253A%252F%252Fmathbits.com%252FMathBits%252FTISection%252FStatistics2%252FlabeledChart2.jpg%3Bhttp%253A%252F%252Fmathbits.com%252FMathBits%252FTISection%252FStatistics2%252Fnormaldistribution.htm%3B721%3B381
the graph is pretty self explanatory and questions about it?
any questions?
just a second sir,
Now it is clear. But one question. May I ask
Why did you divide by 15. It is only 14 parts. Right
Sorry. Now I have fully understood.
It is not the 14 parts. It is the area of that part.
Thank you very much explaining in detailed manner
Thanks for your patience and analysing for a lehman.
Mean 80 standard deviation 10 z=-0.67 X=73.3
mine answer is 73.3 marks min to get A
you have to take Z value -0.67
musadiq no try taking 0.67 Z
well table value is 0.67 that's lies at left side !

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