exam Maths Puzzle Numerical Ability

For a throw of a fair tetrahedral die with its faces marked 1,2,3,4 respectively, the score X represents the number of the face which lands on the floor. Find the mean and the variance of X.

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exam Other Question

question 3x-y<6
x>1
y<3
Please solve graphically, P.S there is a line under each of the <,> symbols.

I thank you in advance for your help. Which function below forms a growth curve?
a) y= .3(1.1)^x/3
b) y=2.1(.8)^x
c) y= (10)^-1x
d) y= .7(2)^-x/2
I think it is (a) ??????????/