calculations in boxes are wrong. cannot get this solved correctly? please help!!

Question

calculations in boxes are wrong. cannot get this solved correctly? please help!!!

Saved Help Save & Exit Submi Check my work Customers experiencing technical difficulty with their Internet cable hookup may call an 800 number for technical support. It takes the technician between 18 seconds and 13 minutes to resolve the problem. The distribution of this support time follows the uniform distribution a. What are the values for a and b in minutes? (Do not round your intermediate calculations.) 0.5 6 10.0 b-1. What is the mean time to resolve the problem? (Do not round your intermediate calculations. Round your answer to 2 decimal places.) Mean 5.25 b-2. What is the standard deviation of the time? (Do not round your intermediate calculations. Round your answer to 2 decimal places.) Prev 2 of 6 Next

Explanation / Answer

a)
a = 18 sec = 18/60 = 0.3 min

b = 13 min

b-1.

mean = (a + b)/2 = 6.65

b-2.
Variance = (b - a)^2/12 = 13.4408

std. dev. = sqrt(variance) = 3.6662

c.
P(X > 5)
= (13 - 5)/(13 - 0.3)
= 0.6299

Hence 62.99%

d.
We need to create two equations for this
1. For lower 25%
0.25 = (x - 0.3)/(13 - 0.3)
x = 3.475

1. For upper 75%
0.75 = (x - 0.3)/(13 - 0.3)
x = 9.825

End Point 1 = 3.475
End Point 2 = 9.825

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