The mean of 20 observations is 15. On checking it was found that two observations were wrongly copied as 3 and 6. If wrong observations are replaced by correct values 8 and 4, then the correct mean is
When xi and yi are two variables (i=1,2,...,n) with geometric means G1 and G2 respectively then the geometric mean of xi/ yi is
The algebraic sum of the deviations of a set of n values from their arithmetic mean is
A distribution with more than two modes is called
10 is the mean of a set of 7 observations and 5 is the mean of a set of 3 observations. The mean of a combined set is given by
The mean and median of 100 items are 50 and 52 respectively. The value of the largest item is 100. It was later found that it is actually 110. Therefore, the true mean is ___ and the true median is _____