Highest common factor of 15 30 and 45
2 answers:
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Area = width * length
if width = 3/8 length ⇒ length = 8/3 width
area = width * 8/3 width = 8/3 width² = 6
width² =
width =
if width = 3/8 length ⇒ length = 8/3 width
area = width * 8/3 width = 8/3 width² = 6
width² =
width =
Answer:
The mean of the total repair time is 150 minutes.
The variance of the total repair time is 725 minutes^2.
Step-by-step explanation:
To solve this problem, we have to use the properties of the mean and the variance. Our random variable is the sum of 3 normal variables.
In the case, for the mean, we have that the mean of the sum of 3 normal variables is equal to the sum of the mean of the 3 variables:
For the variance, we apply the property for the sum of independent variables (the correlation between the variables is 0):