A variable is normally distributed with mean 50 and standard deviation 15. Approximately what percentage of values lie between 20 and 80?

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A particle moves along a line with displacement $x = t^{3} - 6 t^{2} + 9 t$ metres at time $t$ seconds. At what time $t > 0$ is the particle first…
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A variable is normally distributed with mean… | Victorian VCE