Homework Answers
from standard normal table ;for top 40% and bottom 10% , crtiical z are 0.25 and -1.28
Therefore
μ +0.25σ =9 .............(1)
μ -1.28σ =7 .............(2)
solving above:
σ=(9-7)/(0.25+1.28)=1.3072
and μ=9-0.25*1.3072 =8.6732
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