exam Maths Puzzle Numerical Ability

Simplify: (25)1/2(27)-1/3
note- the 1/2 and -1/3 are exponents

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exam Other Question

3 radical 25 over 4 The relationship between the empirical rule and a z-score would indicate that any z-score between �2 and 2 will occur about ___________ percent of the time.