Objective Questions

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.. A mininum of 8 questions here (along with answers)

1. What is the function for calculating sum of a list?

   sum

2. Calcutate the mean of the given list?

   student_marks=[74,78,56,87,91,82]

   mean(student_marks) 

3. Given a two dimensional list,

   two_dimensional_list=[[3,5,8,2,1],[4,3,6,2,1]]

   how do we calculate the mean  of each row?

   mean(two_dimensinal_list,1)

4. What is the function for calculating standard deviation of a list?

   std

5. Calcutate the median of the given list?

   student_marks=[74,78,56,87,91,82]

   median(age_list)

6. How do you calculate median along the columns of two dimensional array?

    median(two_dimensional_list,0)

7. What is the name of the function to load text from an external file? 

   loadtxt

8. I have a file with 6 columns but I wish to load only text in column 2,3,4,5. How do I specify that?

   Using the parameter usecols=(2,3,4,5)

Larger Questions

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.. A minimum of 2 questions here (along with answers)

1. Get the weighted mean of [74,64,86,76,83] where the weights are 

   [2,2,1,4,4] respectively.

   Hint: Readup on function average using average?

2. Calculate the weighted standard deviation for the sequence [74,64,86,76,83], such that the weights are [2,2,1,4,4] .