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. A library has an average of 510 visitors on Sundays and 240 on other day. The average number of visitors in a month of 30 days starting with sunday is
280
285
290
295
Answer: Option B
Explanation:
As the month begin with sunday, so there will be five sundays in the month. So result will be:
\begin{aligned}
= (\frac{510 \times 5 + 240 \times 25}{30})
= (\frac{8550}{30}) = 285
\end{aligned}
2. Average of 10 numbers is zero. At most how many numbers may be greater than zero
0
1
5
9
Answer: Option D
3. A batsman makes a score of 87 runs in the 17th match and thus increases his average by 3. Find his average after 17th match
36
37
38
39
Answer: Option D
Explanation:
Let the average after 17th match is x
then the average before 17th match is x-3
so 16(x-3) + 87 = 17x
=> x = 87 - 48 = 39
4. 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}
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}