DSE 2011 QUESTION40

[eco'17]

http://economicsentrance.weebly.com/uploads/1/1/0/5/1105777/2011-option-a.pdf 

I don't know how are we supposed to approach such questions, when it comes to uniform distribution, all I recall is we can use proportion of areas and midpoints......please tell how to solve these types of questions

[Halflife]

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[eco'17]

no the answer is not 50 its 62.5 (b)

On Tue, Mar 14, 2017 at 2:01 PM, Halflife [via Discussion forum] <[hidden email]> wrote:

Is the answer (a) 50?

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[Abhitesh]

Uniform distribution means that the any marks can be scored with equal probability. So probability(in case of discrete variable) or pdf (in case of continuous variable) will be constt. P(x) = constt.
50 seems to be correct, since the expected score in second test is 50 so the student will decide for retest if his score in first test is less than 50.