18) Find Mean of salary of 60 workers of a factory from the following table
Salary (in Rs) 3000 4000 5000 6000 700 8000 9000 10000 Total
No. of
workers
14 12 10 9 12 8 4 2 3
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Answer:
Salary (in Rs) (xi)
Number of workers (fi)
fixi
Explanation:
Salary (in Rs) (xi)
Number of workers (fi)
fixi
3000
16
3000 × 16 = 48000
4000
12
4000 × 12 = 48000
5000
10
5000 × 10 = 50000
6000
8
6000 × 8 = 48000
7000
6
7000 × 6 = 42000
8000
4
8000 × 4 = 32000
9000
3
9000 × 3 = 27000
10000
1
10000 × 1 = 10000
Total 305000/60 = 5083.33
Therefore, mean salary of 60 workers is Rs 5083.33.
xf = 20 + 60 + 90 + 70 + 120 = 360
f = 5 + 10 + 10 + 7 + 8 = 40
Therefore mean = 360/40
=9
Given: Mean = 20
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