Which expression calculates the average of first_num and second_num?

first_num = input('Enter the first number: ')
second_num = input('Enter the second number: ')

Question

Which expression calculates the average of first_num and second_num?

first_num = input('Enter the first number: ')
second_num = input('Enter the second number: ')

BlackTom AI · Accepted Answer

The question asks which expression calculates the average of first_num and second_num. The surrounding code shows two inputs captured as strings: first_num = input('Enter the first number: ') and second_num = input('Enter the second number: ').
Option analysis:
- No answer options are provided in the data. Without a list of choices, we cannot compare alternatives or rule out incorrect formulas, so we can only evaluate the given candidate expression in isolation.
- The expression (float(first_num) + float(second_num)) / 2 takes both inputs, converts them to floating-point numbers, adds them, and divides by 2. This matches the standard formula for the arithmetic mean of two numbers: mean = (a + b) / 2.
- Why the conversions matter: inputs from input() are strings by default. Wrapping them with float() ensures numeric addition rather than concatenation (which would occur if you did first_num + second_num with strings).
- Why division by 2 is appropriate: in Python 3, the / operator performs floating-point division, yielding a numeric mean that can be non-integer. If you want an integer average, you could use // 2 after conversion, or cast the final result.
- Potential edge cases and clarifications: If either input cannot be parsed as a float, a ValueError will be raised; you might want try/except handling or input validation. If you only need integers, using int() instead of float() would give integer arithmetic, albeit less flexible for decimals.
- In summary, among typical expressions for averages, (float(first_num) + float(second_num)) / 2 correctly computes the average of the two numbers provided by the user.

CSE-20-01 Practice Midterm

Which expression calculates the average of first_num and second_num? first_num = input('Enter the first number: ') second_num = input('Enter the second number: ')

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