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Hai sign in to kacokaco? Will the height of Mercury barometer decrease due to lower atmospheric pressure? Given that x is a normal variable with mean μ = 49 and standard deviation σ = 7.1, find the following probabilities. P(x ≤ 60)? How stable is selenium? 2 sounds of 3000Hz & 6000Hz frequencies emerge from .50m diameter circular opening of speaker. Find diffraction angle for sound of each freq?