Page 210 - Maths Skills - 8

208 Maths

MIND MAP

Bar Graph
Vs

Histogram Data Handling Probability

Bar Graph Histogram

Y Y

X X
� It is used for ungroup data � It is used for group data
� Bars are equally distanced from � There is no gap between the consecutive
each other bars
� Rectangular bars are drawn on � Rectangular bars are drawn on one axis
one axis depicting the variables depicting the variables
� The values of those variables is � The values of those variables is shown on
shown on the other axis the other axis
� The width of the bar should be � The width of bar may be vary and according
uniform to corresponding class frequencies
� Height of bar depends upon the � Height of bar depends upon the value of
value of the variable the variable

Rememberable Points

� 0 < P(E) < 1
� Probability of an impossible event is O
� Probability of a sure event is 1
� The set of all possible outcomes in an
experiment is called sample space
Important Terms Two events which have no outcomes in
� Range = Highest Value – Lowest Value � common are called mutually exclusive events
� Class size = (Upper – Lower) Class limits � Two events are said to be independent if
Upper Limit + Lower Limit occurrence of one event does not affect the
� Class Mark =
2 other event