Statistics - Important Points
CBSE Class 9 - Mathematics
① In statistics we study collection, presentation analysis and interpretation of data.② Facts or figures collected with a definite purpose are called data.
③ Data are fundamental. Statistical tests are performed on raw not manipulated data.
④ The number of times an observation occurs in the given data is called frequency of the observation.
⑤ Class intervals are the groups in which all observations are divided.