exam Maths Puzzle Numerical Ability

IQ scores have a normal distribution with a mean of 100 and a standard deviation of 15. What two IQs separate the middle 95 percent from the remainder of the distribution?

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exam Other Question

You own a business that sells silk-screened shirts. You want to know how many shirts you must sell to "break even". Your costs are 1500$ for the silk-screen equipment, plus 18$ in Simplify

y/b + x/b
____________
y/b - x/b