Ten coins were tossed together a number of times. The distribution of the number of heads obtained is given in the following table :

No of heads	0	1	2	3	4	5	6	7	8	9	10
Frequency	2	7	23	36	11	61	100	12	8	5	3

Calculate, correct to three decimal places, the :

(a) mean number of heads ;

(b) probability of getting an even head ;

(c) probability of getting an odd number.