exercise 1
calculate the variance and standard deviation
exercise 2
calculate the variance and standard deviation
exercise 3
calculate the variance and standard deviation
exercise 4
calculate the variance and standard deviation
exercise 5
calculate the variance and standard deviation
exercise 6
calculate the variance and standard deviation
exercise 7
calculate the variance and standard deviation
exercise 8
calculate the variance and standard deviation
exercise 9
calculate the variance and standard deviation
exercise 10
calculate the variance and standard deviation
