Khan Academy
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Khan Academy
Khan Academy
We can calculate the mean (or expected value) of a discrete random variable as the weighted average of all the outcomes of that random variable based on their probabilities. We interpret expected value as the predicted average outcome if we looked at that random variable over an infinite number of trials.
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Assume the random variable X is normally distributed with mean µ = 50 and standard deviation ? = 7. Compute the probability. Be sure to draw a normal curve with the area corresponding to the probability shaded.P(35 < X < 65)Click the icon to view a table of areas under the normal curve.Which of the following normal curves corresponds to P(35 < X < 65)?P(35 < X < 65) = .8251(Round to four decimal places as needed.)
Assume the random variable X is normally distributed with mean µ = 50 and standard deviation ? = 7. Compute the probability. Be sure to draw a normal curve with the area corresponding to the probability shaded.P(35 < X < 65)Click the icon to view a table of areas under the normal curve.Which of the following normal curves corresponds to P(35 < X < 65)?P(35 < X < 65) = .8251(Round to four decimal places as needed.)
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