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A z-value Multiple Choice is the standard deviation for the standard normal probability distribution is a...

A z-value

Multiple Choice

is the standard deviation for the standard normal probability distribution

is a measure of how many standard deviations the mean is from the median

is the difference of the mean and the probability of z

is a measure of how many standard deviations an observation is from the mean

Math   Statistics-And-Probability   
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Answer #1

Solution :

A z-value is a measure of how many standard deviations an observation is from the mean .

P( - 1< X < + 1) = 68%

P( - 2< X < + 2) = 95%

P( - 3< X < + 3) = 99.7%

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