exam Maths Puzzle Numerical Ability

Please help me solve this equation: x^5/3y divided by xy^-1/2=

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A sample of 25 electric motors is taken from a large lot. The average current drawn by each motor at rated speed and RPM is 7.65 amps. The standard deviation of the sample is 0.1 Kit earned 75 points out of 80 possible on her test. Write the decimal equivalent of this fraction.