Q.226- The average of 50 numbers is 38. If two numbers, namely 45 and 55 are discarded, the average of the remaining numbers is ?
Q.227 The average of a collection of 20 measurements was calculated to tb 56 cm. But later it was found that a mistake had occurred in one of the measurement which was recorded as 64 cm., but should have been 61 cm. The correct average must be.
Q.228- A cricketer whose bowling average is 24.85 runs per wickets, takes 5 wickets for 52 runs in next inning and thereby decreases his average by 0.85. The number of wickets taken by him till the last match was :
Q.229- The average of n numbers x1, x2.....xn is $$\overline{\boldsymbol{x}} .$$ Then the value of $$\sum_{i=1}^{n}\left(x_{i}-\bar{x}\right)$$ is equal to.
Q.230- A library has an average number of 510 visitors on sunday and 240 on other days. The average number of visitors per day in a month of 30 day beginning with sunday is –