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Dr. Md Rushad Rahman
এমবিবিএস(আরপিএমসি)
,
পিজিটি(মেডিসিন)
First, calculate the mean or average of all of the data points. Then, calculate the difference between each data point and that mean. Square each of those differences, add them all up, then divide them by n (the total number of data points) minus 1.
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