SOLUTION: Assume the random variable x is normally distributed with the Mean = 89 and standard deviation = 4. Find the indicated probability P(77 < x < 85)

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Question 1110455: Assume the random variable x is normally distributed with the Mean = 89 and standard deviation = 4. Find the indicated probability P(77 < x < 85)
Answer by stanbon(75887) About Me  (Show Source):
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Assume the random variable x is normally distributed with the Mean = 89 and standard deviation = 4. Find the indicated probability P(77 < x < 85)
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z(77) = (77-89)/4 = -12/4 = -3
z(85) = (85-89)/4 = -4/4 = -1
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P(77 < x < 85) = P(-3 < z < -1) = normalcdf(-3,-1) = 0.1573
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Cheers,
Stan H.
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