A. Whenever there is a data point 0, then you cannot compute the Harmonic mean

Like zero, it is impossible to calculate Geometric Mean with negative numbers. However, there are several work-around for this problem, all of which require that the negative values be converted or transformed to a meaningful positive equivalent value.

A. Median is the 50th percentile which is equal to 5th decile, each decile denotes 10 percentile

A. Bi-modal

A. A series can have more than one value for mode. Example – 2,3,4,5,5,5,4,4,6,7,7 Here both 5 and 4 are mode