See Exercise 7.9 in Chapter 7 Programming Exercise from the Book for the description.

Question

Sample Run

Enter numbers: 1.9 2.5 3.7 2 1 6 3 4 5 2

The mean is 3.11

The standard deviation is 1.55738

Answer 1

import math

def calculate_mean(lst):

if not lst:

return 0

return sum(lst) / len(lst)

def calculate_standard_deviation(lst):

mean = calculate_mean(lst)

variance = sum((x - mean) ** 2 for x in lst) / len(lst)

std_deviation = math.sqrt(variance)

return std_deviation

def main():

# Prompt the user to enter a list of numbers separated by a space

input_list = input("Enter numbers: ").split()

# Convert the input string list to floats

try:

input_list = [float(num) for num in input_list]

except ValueError:

print("Invalid input. Please enter a list of numbers.")

return

# Calculate the mean and standard deviation

mean = calculate_mean(input_list)

std_deviation = calculate_standard_deviation(input_list)

# Display the results

print("The mean is", round(mean, 2))

print("The standard deviation is", round(std_deviation, 5))

if __name__ == "__main__":

main()