Question

find the mean salary of 60 workers of a factory from the following table
salary (in Rs) number of workers
3000 16
4000 12
5000 10
6000 8
7000 6
800 4
900 3
10000 1



find the mean of the following distribution
x 4 6 9 10 15
f 5 10 10 7 8


find the value of p if the mean of the following data is 40.4
variable frequency (f)
10 3
20 8
30 12
40 5
50 p
60 7
70 5



pls answer it fastttttt

Answer 1

We know that



The value of and can be calculated as follows.

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

Answer 2

Mean= sum of salary*workers with the salary\total no of workers

=305000/60

=5083.33 rupees

Hope it helps

Regards

Rohan Dheeraj