Practice30Create account

Two numbers have an arithmetic mean of 13 and a harmonic mean of . What is the difference between the two numbers?

Competition practiceStatistics
  • A6
  • B10
  • C12
  • D8

Step-by-Step Solution

For two numbers, , so the product is 144 and the sum 26. Then , difference 10 (the numbers are 18 and 8).
Answer: B) 10

Master this topic in 30 minutes a day.

Don't just memorise the answer — build a daily practice habit.

Practice 5 Similar Questions Free →

All Statistics practice questions

More Statistics practice

The average of 7 consecutive even numbers is A. If the next 5 consecutive even numbers…In a frequency table with equal classes of width 5, one class has class mark 27.5. What…Classes 0–10, 10–20, 20–30 and 30–40 have frequencies 3, 7, 12 and 8. What is the…The marks in a quiz are grouped in inclusive classes 0–9, 10–19, 20–29 and so on. What…Weekly study hours of 25 students: 0–5 hours – 3 students, 5–10 – 8, 10–15 – 9, 15–20 –…