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Author Question: Assume that x is a normally distributed random variable with a mean of 70 and a standard deviation ... (Read 46 times)

geodog55

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on: Jul 24, 2018
Assume that x is a normally distributed random variable with a mean of 70 and a standard deviation of 10 Find P(x < 48).

Question 2

Assume that x is a normally distributed random variable with a mean of 70 and a standard deviation of 10 Find P(48 < x < 88).


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princessflame2016

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Reply #1 on: Jul 24, 2018
Answer to Question 1

P(x < 48) = P(z < -2.20) = 0.5000  0.4861 = 0.0139

Answer to Question 2

P(48 < x < 88) = P(-2.20 < z < 1.80) = 0.4861 + 0.4641 = 0.9502


geodog55

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Reply 2 on: Jul 24, 2018
Great answer, keep it coming :)

yeungji

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Reply 3 on: Yesterday
Wow, this really help

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