Suppose the times required for a cable company to fix cable problems in its customers' homes are uniformly distributed between 13 minutes and 20 minutes. what is the probability that a randomly selected cable repair visit will take at least 19 minutes? (enter the final answers reduced to the lowest possible fraction.)

Step-by-step explanation:

The probability density function for x which is uniformally distributed in interval [a,b] is given by :-

Given : The times required for a cable company to fix cable problems in its customers' homes are uniformly distributed between 13 minutes and 20 minutes.

Then,

Now, the probability that a randomly selected cable repair visit will take at least 19 minutes will be :_

Hence, the probability that a randomly selected cable repair visit will take at least 19 minutes =

dude thats to long figure it

step-by-step explanation:

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional