1. (a) Calculate mean. median and mode from the following frequency distribution of marks at a test in English.
|
Marks 5
|
10 15
|
20 25
|
30 35 40
|
45 50
|
|
.No. of studems: 20
|
43 75
|
76 72
|
45 39 9
|
8 6
|
(b) Geometric mean of 2 numbers is 15. If by mistake one figure is taken as 5, instead of 1, find correct geometric mean.
2. (a) A market with 330 firms has the following distribution of average number of laborers in different income groups:
Incommensurable
|
(value) Rs.
|
450
|
750
|
1050
|
1350
|
1650
|
|
No. of firms
|
80
|
64
|
52
|
56
|
78
|
|
Average no. ofworkers
|
16
|
24
|
15
|
17
|
8
|
Find the median income of all the orders.
(b) Determine the Geometric mean for the following values:
X 5 8 12 16