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Average of 10 numbers is zero. At most how many numbers may be greater than zero

  • 0
  • 1
  • 5
  • 9

Answer: Option D

Similar Questions :

1. Reeya obtained 65, 67, 76, 82 and 85 out of 100 in different subjects, What will be the average.

  • 70
  • 75
  • 80
  • 85

Answer: Option B

Explanation:

\begin{aligned}
( \frac {65+67+76+82+85}{5} ) = 75
\end{aligned}

2. Find the average of all numbers between 6 and 34 which are divisible by 5

  • 15
  • 20
  • 25
  • 30

Answer: Option B

Explanation:

\begin{aligned}
Average = (\frac{10+15+20+25+30}{5}) = \frac{100}{5} =20
\end{aligned}

3. Average of five numbers is 27. If one number is excluded the average becomes 25. The excluded number is

  • 35
  • 45
  • 55
  • 65

Answer: Option A

Explanation:

Number is (5*27) - (4*25) = 135-100 = 35

4. Average weight of 10 people increased by 1.5 kg when one person of 45 kg is replaced by a new man. Then weight of the new man is

  • 50
  • 55
  • 60
  • 65

Answer: Option C

Explanation:

Total weight increased is 1.5 * 10 = 15.
So weight of new person is 45+15 = 60

5. Find the sum of first 30 natural numbers

  • 470
  • 468
  • 465
  • 463

Answer: Option C

Explanation:

Sum of n natural numbers
\begin{aligned}
= \frac{n(n+1)}{2}
\end{aligned}

\begin{aligned}
= \frac{30(30+1)}{2} = \frac{30(31)}{2} = 465
\end{aligned}

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