(b) Use short-cut method to find the mean of monthly wages of
a certain number of workers. pls help
Answers
Given : Monthly wages of workers
To Find : Mean wages
New Mean If :
Monthly wages of each worker is increased by 30 %
Number of workers in each category is halved
In each category Number of workers doubles and wages reduced by 20 %
Step-by-step explanation:
CI Class Mark x f fx
90 - 110 100 4 400
110 - 130 120 6 720
130 - 150 140 4 560
150 - 170 160 8 1280
170 - 190 180 18 3240
40 6200
Mean wages = 6200/40 = 155
Monthly wages of each worker is increased by 30 %
Hence new mean = 155 + (30/100)155 = 201.5
Number of workers in each category is halved
Hence 6200 /2 = 3100 and 40/2 = 20
New Mean = 3100/20 = 155 remains same , no change
In each category Number of workers doubles and wages reduced by 20 %
Number of workers doubled cause no impact on mean
wages reduced by 20 % hence new mean = 155 - (20/100)155 = 124
Learn More
1.The daily wages of 80 workers of a factory.Daily wages (Rs) 500 ...
brainly.in/question/12385845
After settlement, the average weekly wage in a factory had ...
brainly.in/question/19026105