exam Maths Puzzle Numerical Ability

When calculating standard deviation, why do we use (n-1) for sample datasets, but just (N) for population datasets?

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exam Other Question

Can someone Please, Please, Please help me solve tis problem by using the Quadratic Formula! I am desperite! Thank You!

Solve by Using the Quadratic Formula:

x^2 - 7x - 1= -7 If $350 is deposited in an account paying 12% of annual interest compounded monthly, then how much is in the account at the end of 6 years and 6 months?