From the given table, find the rarest blood group.
Blood GroupFrequencyAB6A5B3O1Total15
AB
A
B
O
In the given table, the lowest frequency is for group O. So, blood group O is the rarest.
The following table gives the literacy rate (in percentage) of 35 cities. Find the mean literacy rate by step deviation method. Literacy rate (in %)No. of cities44−55355−651065−751175−85885−953
Based on the information given in the table, identify the kind of series the table represents : MarksFrequency100−19980200−299123300−39934400−49948
Find the coefficient of mean deviation about median for the following cumulative frequency distribution: xfrequencyCumulative frequency221134233925458135482156930684347843884240