Write python codes for these.

1. The scores from a class test are as follows: five students scored 12, three students scored 60, four students scored 72, six students scored 100 marks. Write a Python program to print the Mean, Median, Variance and Standard deviation of the scores.

2. Following table represents the frequency of the weights of 25 students in a team: -

Weight (lbs)	Number of students
88	4
76	3
65	5
96	2
52	5
98	2
102	4

Write a python program to create a histogram (using pyplot) for the above table.

3. For the data given in question 2, write a Python program to create a dictionary, which maps the values to their frequencies and calculates the probability of each weight using their frequencies.

4. Write a Python program using only numpy functions that creates a matrix of 3 columns and 8 rows with sequential integers from 0-23.