Temperature Neutrons: Solve Equations for K

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Homework Statement



see attached

Homework Equations


\lambdamaxT=2.898*10^-3
\lambdamedT=4.107*10^-3

The Attempt at a Solution


I have tried both the above equations (12834375K and 9056250K) both are wrong..
not sure where to go?
thanks for any help
 
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