Questions of Standard Deviation, mean and mode

DISCRETE SERIES

Marks	1	6	11	16	21	26
Students	4	8	12	8	7	2

Class	8	9	10	11	12	13	14
Students	15	18	23	25	20	18	10

X	10	20	30	40	50	60
F	6	8	12	10	9	1

Marks	25	26	27	28	29	30	31
No	12	15	16	20	14	14	8

X	5	15	25	35	45	55
F	1	3	8	6	4	2

Marks	20	30	40	50	60	70
Students	6	10	15	14	13	10

No	30	50	70	90	110
year	4	6	6	3	2

Class	10	20	30	40	50	60
Students	6	15	16	12	8	7

X	10	9	8	7	6	5
F	1	4	9	6	5	4

X	50	45	40	35	30	25	20
F	4	9	12	15	9	8	2