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Ksenya-84 [330]
3 years ago
8

A standardized​ exam's scores are normally distributed. In a recent​ year, the mean test score was 1491 and the standard deviati

on was 312. The test scores of four students selected at random are 1910​, 1230​, 2190​, and 1380. Find the​ z-scores that correspond to each value and determine whether any of the values are unusual.
Mathematics
1 answer:
Alinara [238K]3 years ago
7 0

Answer:

z(1910)=1.3429\\\\z(1230)=-0.9006\\\\z(2190)=2.2404\\\\z(1380)=-0.3558

Step-by-step explanation:

-Given the population mean is \mu=1491and  the standard deviation is \sigma=312, we calculate the z-scores using the formula:

z=\frac{\bar x-\mu}{\sigma}

#The z-score for 1910 can be calculated as:

z(1910)=\frac{x-\mu}{\sigma}\\\\=\frac{1910-1491}{312}\\\\=\frac{419}{312}\\\\=1.3429

#The z-score for 1230can be calculated as:

z(1230)=\frac{x-\mu}{\sigma}\\\\=\frac{1230-1491}{312}\\\\=\frac{-281}{312}\\\\=-0.9006

#The z-score for 2190 is calculated as follows:

z(2190)=\frac{x-\mu}{\sigma}\\\\=\frac{2190-1491}{312}\\\\=\frac{699}{312}\\\\=2.2404

#The z-score for 1380 is calculated as:

z(1380)=\frac{x-\mu}{\sigma}\\\\=\frac{1380-1491}{312}\\\\=\frac{-111}{312}\\\\=-0.3558

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