Question Detail Average of 10 numbers is zero. At most how many numbers may be greater than zero 0159 Answer: Option D Similar Questions : 1. Average of first five multiples of 3 is 9111315 Answer: Option AExplanation:\begin{aligned} Average = \frac{3(1+2+3+4+5)}{5} = \frac{45}{5} = 9 \end{aligned} 2. The average score of a cricketer for ten matches is 38.9 runs. If the average for first six matches is 42, then average for last four matches is 33.2532.2534.2534.50 Answer: Option CExplanation:\begin{aligned} = \frac{(38.9 \times 10)-(42 \times 6)}{4} \end{aligned} \begin{aligned} = \frac{(1216 - 750)}{4} = 34.25 \end{aligned} 3. The average of six numbers is X and the average of three of these is Y.If the average of the remaining three is z, then x = y + z2x = y + zx = 2y + zx = y + 2z Answer: Option BExplanation:X =((3y+3z)/6) or 2X= y + z 4. Find the average of first 10 multiples of 7 35.537.538.540.5 Answer: Option CExplanation:\begin{aligned} = \frac {7(1+2+3+...+10)}{10} \end{aligned} \begin{aligned} = \frac {7(10(10+1))}{10 \times 2} \end{aligned} \begin{aligned} = \frac {7(110)}{10 \times 2} = 38.5 \end{aligned} 5. A motorist travel to a place 150 km away at an avearge speed of 50 km/hr and returns ar 30 km/hr.His average speed for the whole jouney in km/hr is 36.5 km/hr37.5 km/hr35.5 km/hr34.5 km/hr Answer: Option BExplanation:Average speed will be \begin{aligned} \frac{2xy}{x+y} km/hr= \frac{2(50)(30)}{50+30} km/hr \end{aligned}= 37.5 km/hr Read more from - Average Questions Answers