STATISTICAL TECHNIQUES AND TOOLS
Z DISTRBUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The monthly phone bills in a city are normally distributed with a mean of 30$ and a standard deviation of 12$. Find the x-value that correspond to z-scores of 3.17.
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$1.80
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$68.04
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$32.76
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None of the above
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Explanation:
Detailed explanation-1: -z = (X – ) / where X is a normal random variable, is the mean of X, and is the standard deviation of X. You can also find the normal distribution formula here. In probability theory, the normal or Gaussian distribution is a very common continuous probability distribution.
Detailed explanation-2: -The standard normal distribution is a special case of the normal distribution. For the standard normal distribution, the value of the mean is equal to zero (=0), and the value of the standard deviation is equal to 1 (=1).
There is 1 question to complete.