- What is the formula to calculate standard deviation?

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Can someone show me step by step how to do number 12. The answer is 9 but I keep getting 7!? Write the complete ionic equation for the combination of an aqueous solution of sodium sulfide and an aqueous solution of lead(II) nitrate.? If a patient is losing blood too fast to wait for blood to be typed and matched, what are two possible treatments that can be given? How do you solve the integral ((x^2)+4)/ ((3x^3)+(4x^2)-4x) using partial fractions? Matter is never created or destroyed by chemical reactionsExplain how the law of conservation of mass is supported when a log burns a fire.?