exercise 1
calculate the variance and standard deviation of the grads
exercise 2
calculate the variance and standard deviation of the hight
exercise 3
calculate the variance and standard deviation of the weight
exercise 4
calculate the variance and standard deviation income
exercise 5
calculate the variance and standard deviation of the grads
exercise 6
calculate the variance and standard deviation of the grads
exercise 7
calculate the variance and standard deviation of the hight
exercise 8
calculate the variance and standard deviation of the weight
exercise 9
calculate the variance and standard deviation income
exercise 10
calculate the variance and standard deviation of the grads
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