Could somebody please explain how you were suppose to go about 7b for me please.
I used the rectangular distribution between 1 and 4 to calculate the E(X)=2.5 in that region, then integrated xf(x) between 4 and 6 and added 4 to it to calculate the E(X)=31/6 in that region. Then I averaged these two numbers to get somebody like 3.83. I didn't think I had got it right in the exam, but I'm curious about method marks for this question.
I hope everybody else found the exam okay btw!:-)