exercise 21
calculate the variance and standard deviation
exercise 22
calculate the variance and standard deviation
exercise 23
calculate the variance and standard deviation
exercise 24
calculate the variance and standard deviation
exercise 25
calculate the variance and standard deviation
exercise 26
calculate the variance and standard deviation
exercise 27
calculate the variance and standard deviation
exercise 28
calculate the variance and standard deviation
exercise 29
calculate the variance and standard deviation
exercise 30
calculate the variance and standard deviation
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