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Given that zmr001-1.jpg = –2 and zmr001-2.jpg = –1, which of the following do you know?
The variance is 10.
The standard deviation is 30.
The mean is 80.
The median is 40.
The data point x = 20 is 2 standard deviations from the mean.
The data point x = 50 is 1 standard deviation from the mean.
The data point x = 45 has a z-value of 1.5.

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Answer:

B, C, E, and F are all the right answers

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Lanuel

From the given z-scores, we can deduce the following points:

  1. The standard deviation is 30.
  2. The mean is 80.
  3. The data point x = 20 is 2 standard deviations from the mean.
  4. The data point x = 50 is 1 standard deviation from the mean.

Given the following data:

  • [tex]Z_{20}=-2[/tex]
  • [tex]Z_{50}=-1[/tex]

What is a z-core?

A z-core is also referred to as a standard score and it can be defined as a measure of the distance between a data point (raw score) and the mean, when standard deviation units are used.

In Statistics, z-scores can either be positive or negative and it is calculated by using this formula:

[tex]Z=\frac{x\;-\;u}{\delta}[/tex]

Where:

  • x is the observed data.
  • u is the mean.
  • [tex]\delta[/tex] is the standard deviation.

Based on the given z-scores, we can deduce the following points:

  1. The standard deviation is 30.
  2. The mean is 80.
  3. The data point x = 20 is 2 standard deviations from the mean.
  4. The data point x = 50 is 1 standard deviation from the mean.

Read more on z-scores here: https://brainly.com/question/4302527

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