Question 1202552
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The tutor @mananth has the right idea. 


However, we won't divide by n = 28, because this computes the population variance.


Instead we divide by n-1 = 28-1 = 27 to determine the sample variance.


The sample variance is 55/27 = 2.037 approximately.


Helpful calculator:
<a href="https://www.calculatorsoup.com/calculators/statistics/variance-calculator.php">https://www.calculatorsoup.com/calculators/statistics/variance-calculator.php</a>
Separate the data values with a comma and not a semicolon.
Feel free to explore other such calculators.
A spreadsheet is another good option.


This article talks about the sample variance on a TI84
<a href="https://www.statology.org/sample-variance-ti-84/">https://www.statology.org/sample-variance-ti-84/</a>
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