Math Chapter Wise question with answer

Q01 The mean of first 3 observations is 23, next 2 observations is 18 and the last 3 observations is 21. The mean of al... English · NVS PGT 2022 Q02 Given that ∑ ∑ ∑fi = 80, ∑ ∑ ∑fi xi = 4000 and ∑ ∑ ∑fi |xi − x | =1280 for a set of observations. Mean deviation ab... English · KVS PGT 2022 Q03 The mean and variance of 8 observations and 6 and 8 respectively. If some of these observations are 3, 5, 6, 8, 9,... English · OAVS TGT 2019 Q04 The mean of 100 observations is 50 and their standard deviation is 5. The sum of squares of all observations is– English · KVS TGT 2017 Q05 The mean of 'n' observations is x. If the first observation is increased by 1, the second by 2, the third by 3 and... English · Haryana TGT 2019 Q06 Mean of 100 observations is 45. It was later found that two observations 19 and 31 were recorded incorrectly as 91... English · DSSSB TGT (SECTION-B) 28 DEC 2014