exam Maths Puzzle Numerical Ability

The average amount customers at a certain grocery store spend yearly is $636.55. Assume the variability is normally distributed. If the standard deviation is $89.46, find the proba

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exam Other Question

x varies directly as y and inversely as the square of z. If x=10 when y=8 and z=2, find x when y=12 and z=3. How are the zeros for a function (the values that make the function value equal zero), and the x-intercepts for the graph of the function related to each other?

A quadratic fu