The time needed to complete a job is normally distributed with a mean of 1 hour and standard deviation of 10 minutes. Probability to complete the job in hone hour or more, but less than 70 minutes is:

The value is    

Step-by-step explanation:

From the question we are told that

   The mean is  

    The standard deviation is  

Generally the 1 hour is equivalent to 60 minutes

   Generally the probability to complete the job in one hour or more, but less than 70 minutes is mathematically represented as

=>

=>

=>    

From the  z  table  (Z <  1)  and  (Z <  0 ) is  

and  

=>    

=>            

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8

the number of possible outcomes that do not show a 1 on the first spinner and show the number 4 on the second spinner is 2.

spinner 1 spinner 2

1                     1

1                     2

1                     3

1                     4

2                   1

2                   2

2                   3

2                   4   = not 1, and 4

3                   1

3                   2

3                   3

3                   4 = not 1, and 4

only 2 outcomes have passed the given condition.

step-by-step explanation: