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Provided the distribution is Normal, the z-score is the value such that the probability of observing a smaller value is 0.25. Thus z = -0.67449

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Q: How do you find z score in first quartile?
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What is the z score that corresponds to the first quartile for the standard normal curve?

-0.675


The z-score for the third quartile?

.67


How do you find the z score of 12.5?

To find the Z score from the random variable you need the mean and variance of the rv.To find the Z score from the random variable you need the mean and variance of the rv.To find the Z score from the random variable you need the mean and variance of the rv.To find the Z score from the random variable you need the mean and variance of the rv.


What is the z score that correspond to P18?

Find the Z score that correspond to P25


How do you find out the z-score?

z-score of a value=(that value minus the mean)/(standard deviation)


How do you use a z table?

A z table is used to calculate the probability of choosing something that is normally distributed. In order to use it, first a z score is needed. A z score is the number of standard distributions a value is away from the mean of the data. In order to find the z score, take the value of the datum, subtract the mean, then divide by the standard deviation. The result is a z score. Look up the z score on the table to find the probability of getting anything equal to or lesser than the value you chose.


What is the area to the left of z equals 0.25?

It is the description of z as the lower quartile.


How do you find the number z such that the proportion of observations that are less than z in a standard Normal distribution is 0.7?

You will need to use tables of z-score or a z-score calculator. You cannot derive the value analytically.The required z-score is 0.524401


How do you find the area to the right of the z-score?

Charts typically show and list the area to the left of the Z-Score value. To find the area to the right, just subtract the Z-Score value from 1; e.g. if the Z-Score value is .75 then take 1-.75 = .25.


How do you find probabilty of negative z score?

Let z be positive so that -z is the negative z score for which you want the probability. Pr(Z < -z) = Pr(Z > z) = 1 - Pr(Z < z).


How do you find z score are of 0.79?

To get a z-score one needs a standard deviation and a mean as well as the number.


How do you find a z-score?

Z Score is (x-mu)/sigma. The Z-Score allows you to go to a standard normal distribution chart and to determine probabilities or numerical values.