# Arup Guha
# 10/1/2018
# Program that does some test statistics using a list.

import math

# This is how you create a list in Python.
scores = []

# Prompt the user to enter the scores.
print("Please enter your test scores, ending the list with a -1.")
curscore = int(input(""))

# Read in the scores.
while curscore != -1:

    # Adds a value to the end of a list.
    scores.append(curscore)

    # Get next score.
    curscore = int(input(""))

# Set up my accumuators.
total = 0
minimum = scores[0]
maximum = scores[0]

# Go through each score.
for i in range(len(scores)):

    # Add into our total.
    total += scores[i]

    # Update the minimum if necessary.
    if scores[i] < minimum:
        minimum = scores[i]

    # Do the same for the maximum.
    if scores[i] > maximum:
        maximum = scores[i]

# Store average.
avg = total/len(scores)

# Use Python's Prewritten functions.
print("Min is",min(scores),"Max is",max(scores),"Sum is",sum(scores))

# Print out our stats so far.
print("Min =",minimum,"Max =",maximum,"Avg =",total/len(scores))

# Add up the sum of terms for the variance.
varsum = 0
for x in scores:
    varsum += ((x-avg)**2)

# Print out the standard deviation.
print("The standard deviation is", math.sqrt(varsum/len(scores)))