SOLUTION: Suppose the examination scores in a leaving cert subject can be modelled by a normal distribution with a mean of 62% and a standard deviation of 11%. Using this model
(a) Find th
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(a) Find th
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Question 1102313: Suppose the examination scores in a leaving cert subject can be modelled by a normal distribution with a mean of 62% and a standard deviation of 11%. Using this model
(a) Find the percentage of students who get 90% or more.
(b) Find the percentage of students who fail, i.e get less than 40%.
(c) Tom discovered he scored in the 96th percentile on this exam. What score did he get?
You can put this solution on YOUR website! z=(x-mean)/sd
>(90-62/11 or 28/11 or >2.545.
That probability is 0.0055.
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z<(40-62)/11<-2
That probability is 0.0228
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96%ile is z=+1.75
1.75=(x-62)/11
19.25=x-62
x=81.25% is the score
