Question

A group of statisticians at a local college has asked you to create a set of functions that compute the median and mode of a set of numbers. Define these functions, median and mode, in a module named stats.py. Also include a function named mean, which computes the average of a set of numbers. Each function should expect a list of numbers as an argument and return a single number. Each function should return 0 if the list is empty. Include a main function that tests the three statistical functions using the following list defined in main:List: [3, 1, 7, 1, 4, 10]

Answer 1

Explanation:

def mean(lst):

   if not lst:

       return 0

   total = 0

   for num in lst:

       total + = num

   return total / len(lst)

 

def median(lst):

   if not lst:

       return 0

   samples = sorted(lst.copy())

   if len(samples) % 2 == 1:

       return samples[int(len(samples) / 2)]

   else:

       return (samples[int(len(samples) / 2)] + samples[int(len(samples) / 2) - 1]) / 2

 

def mode(lst):

   if not lst:

       return 0

   result = lst[0]

   count = 0

   for num in lst:

       if lst.count(num) >= count:

           count = lst.count(num)

           result = num

   return result

 

def main():

   userList = [3, 1, 7, 1, 4, 10]

   print('List:', userList)

   print('Mode:', mode(userList))

   print('Median:', median(userList))

   print('Mean:', mean(userList))

 

main()

Answer 2

Answer:

Functions to create a median and mode of a set of numbers

Explanation:

def median(list):

   if len(list) == 0:

       return 0

   list.sort()

   midIndex = len(list) / 2

   if len(list) % 2 == 1:

       return list[midIndex]

   else:

       return (list[midIndex] + list[midIndex - 1]) / 2

def mean(list):

   if len(list) == 0:

       return 0

   list.sort()

   total = 0

   for number in list:

       total += number

   return total / len(list)

def mode(list):

   numberDictionary = {}

   for digit in list:

       number = numberDictionary.get(digit, None)

       if number == None:

           numberDictionary[digit] = 1

       else:

           numberDictionary[digit] = number + 1

   maxValue = max(numberDictionary.values())

   modeList = []

   for key in numberDictionary:

       if numberDictionary[key] == maxValue:

           modeList.append(key)

   return modeList

def main():

   print "Mean of [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]: ", mean(range(1, 11))

   print "Mode of [1, 1, 1, 1, 4, 4]:", mode([1, 1, 1, 1, 4, 4])

   print "Median of [1, 2, 3, 4]:", median([1, 2, 3, 4])

main()