Answer:
4/185 or 0.0216...
Step-by-step explanation:
The mean is 102 and the standard deviation is 2.
The sample mean is equal to the population mean; the sample standard deviation is equal to
σ/√n = 10/(√25) = 2
Angles on a straight line add up to 180°, so:
x + 60 = 180
x = 180 - 60
x = 120°
Let Issac work for x hours, and Ruby works 8 hours more than of Issac, so Ruby work for
hours.
And Svetlana worked four times of Ruby, therefore Svetlana worked for

And total hours they worked together is 136. That is

So Issac worked for 16 hours, Ruby worked for 24 hours and Svetlana worked for 24 times 4 equals 96 hours .
You cut the pieces 2.2cm each