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Is taking Pre-Calculus before AP Statistics a bad idea? The probability that the mean height is less than 40.3 inches is .6991 How do you get to this answer? How do I make a high frequency laser, like a femtosecond laser? Is there a way to make high electromagnetic waves, like gamma ways? If 12.0 mL of 6.9 ✕ 10-2 M HNO3 is added to 10.5 mL of 6.3 ✕ 10-3 M KOH, what is the pH of the solution?