exam Maths Puzzle Numerical Ability

If you have a mean equal to 15 and standard deviation equal to 5. Find the probabilities associated with getting:
a. A 15 or above
b. Between a 15 and an 18
c. A 13 and above

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exam Other Question

|3x+2|less than or equal to 4
I under stand these brackets on the expression mean absolute value but what is the absolute value of 3x+2 ok first i since my computer does not have square roots i will use a big V.Vx3(exponent)y V9x3(exponent)y + 6xVxy