book Maths Puzzle Numerical Ability

How do you solve the square root of a fraction.
Example:The square root of 9/16.

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book Other Question

The lengths of pregnancies of humans are normally distributed with a mean of 268 days and a standard deviation of 15 days. A baby is premature if it is born three weeks early. What percentage of babies are born prematurely? could you please tell me what 7a cubed is??? Thank you