Definition: Arranging the population through some ordering scheme and then selecting the sample by selecting every "nth" individual in the scheme.

noo because no animal can leave it's mother land and freedom even we can't leave some days in a single room by leaving home it is wrong but needed to protect them

even though there may be variations in human emotions over time, the poem “ a contribution to statistics” by wislawa symborska suggests that the only unchangeable characteristic is mortality.

the author poses a distinction between the approximate and non-approximate numbers which correspond to our need for certainty in life and the difficulty of achieving it. our efforts to measure the exact often fail because the world is not always clearly structured .the poem seems to imply   that the only thing that is certain and has an exact number is death.