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Value obtained by reciprocating mean of reciprocal of x1, x2, x3, .... Xn observations is called

If the mean of 5 observations x,x 2,x 4,x 6 and x 8 is 1 then the mean of last 3 observations is

The average of 18 observations was calculated and it was 124. Later on it was discovered that two observations 46 and 82 were incorrect. The correct values are 64 and 28. The correct average of 18 obs

Reciprocal of arithmetic mean of reciprocal of values x1, x2, x3, ....., xn is known as

Positive square root of mean of squared deviations of some observations from their arithmetic mean is called

Mean of squared deviations of some observations from their arithmetic mean is called

The arithmetic mean of the scores of a group of students in a test was 52. The brightest 20% of them secured a mean score of 80 and the dullest 25% a mean score of 31. The mean score of remaining 55%