A design engineer wants to see if the service life of a halogen headlamp is within control. The service life is normally distributed with a mean of 500 hours and a stastandard deviation of 20 hours. What is the sample mean service life for sample 2

Complete Question

The complete question is  shown on the first uploaded image

1

The correct option is C

2

The correct option is C

Step-by-step explanation:

From the table give

  The  sample sample  size is  n  =  4          

Generally the sample mean of the service life for sample 2 is mathematically represented as

Generally the sample mean of the service life for sample 1 is mathematically represented as

Generally the sample mean of the service life for sample 3 is mathematically represented as

Generally the mean of the sampling distribution of sample mean is mathematically represented as

=>      

=>      

3x + 18 = 147°

step-by-step explanation:

3x + 18 = 147°, because the value of the central angle is equal to the value of the arc formed by it.

i hope i you.

175

step-by-step explanation:

2 inches x 10 miles = 200 miles - 3 inches = 175