exam Maths Puzzle Numerical Ability

I am totally lost, I do not know where to even start, I'm so embaressed, I have never been good at graphs let alone logarith equations. Can a tutor please try and solve this equati

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exam Other Question

For the following probability distribution u=_____

xi 250/300/400
pi 0.30/0.50/0.20
Which of the given numbers are composite?
a) 15, 49, 55, 87, 91
b) 15, 55, 87, 91, 105
c) 15, 49, 55, 87, 91, 105
d) 15, 49, 55, 87, 105

Can someone help me with this proble