A cricketer's average in his first 32 innings was 11 runs per innings. After a further 8 innings, his average had decreased to 10 runs per innings. What was his average for the last 8 innings?
32×11 + 8×average = 10×40 8×average = 400 - 352 = 48 average = 6 runs.
In a cricket match, the average runs for the first 25 overs was four.
After a further 50 overs, the average runs rose to eight.
What was the average number of runs for the last 50 overs only?
At the state fair eating contest the winner ate an average of 15 burgers at the first 20 sittings. After a further 20 sittings the average increased to 20 burgers. What was the average for the last 20 sittings?
Raghav scored below runs in his last 7 innings 13, 38, 3, 29, 14, 68, 17.
Find population standard deviation for his score in last 7 innings?
A racing driver drove around a 6 km track at 140 km/hr for 3 km, 168 km/hr for 1.5 km and 210 km/hr for 1.5 km. What was his average speed for the entire 6 km?
The first 25 shoppers on a certain website purchased an average of two items each.
After a further 15 shoppers had made their purchases, the average number of items per person rose to five.
What was the average number of items purchased by each of the last 15 shoppers?
