Multiple choice

If the average time taken by 12 students for making project A is 5 hours and the average time taken by 8 students for making project B is 3 hours, then what would be the mean time of the students for both the projects?

  1. 4.2 hours

  2. 5.8 hours

  3. 6.8 hours

  4. 7.1 hours

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Total time = (12 * 5) + (8 * 3) = 60 + 24 = 84 hours. Total students = 12 + 8 = 20. Mean time = 84 / 20 = 4.2 hours.

AI explanation

The total time for project A is 12 students multiplied by 5 hours, which equals 60 hours. The total time for project B is 8 students multiplied by 3 hours, which equals 24 hours. The combined total time for both projects is 60 hours plus 24 hours, equaling 84 hours. The mean time for all 20 students is 84 divided by 20. The result is 4.2 hours.

Keep practicing — related questions