There is a probability of 77% that the mean of this sample is between 19.25 hours and 21.0 hours
Z score is used to determine by how many standard deviations the raw score is above or below the mean. The z score is given by:

Given that μ = 20, σ = 7, n = 125.
For x = 19.25:

From the normal distribution table, P(-1.20 < z < 0.62) = P(z < 0.62) - P(z < -1.2) = 0.8849 - 0.1151 = 0.7698 = 77%
There is a probability of 77% that the mean of this sample is between 19.25 hours and 21.0 hours
Find out more on z score at: brainly.com/question/25638875
4 significant figures. All figures are significant because the zeros are in between two significant digits
Answer:
.4=a
Step-by-step explanation:
self explanatory
C) m = 8h
In the model, Kevin is earning $8 per hour he works.
Answer:
yes it is and there has to be 20 characters so gonna type random stuff after