Assume that z scores are normally distributed with a mean of O and a standard deviation...

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Assume that z scores are normally distributed with a mean of O and a standard deviation of 1. If Pl-a<z<a) = 0.4314, find a. Question 5 O out of 2 points A coin is tossed 20 times. A person, who claims to have extrasensory perception, is asked to pre

math Statistics-And-Probability

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Answer 1

Answer #1

Solution :

Using standard normal table,

P(-a Z a) = 0.4314

P(Z a) - P(Z -a) = 0.4314

2P(Z a) - 1 = 0.4314

2P(Z a) = 1 + 0.4314 = 1.4314

P(Z a) = 1.4314 / 2 = 0.7157

P(Z 0.57) = 0.7157

z = 0.57

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Answer 2

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