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

=>      

=>      

i think it's either c or d

step-by-step explanation: the entire question is extremely odd. 04 obviously refers to the interest rate. honestly i will say the answer is c. because the (2 x 12) part would mean it's compounded semiannually. i'll say choose c.

square root

step-by-step explanation: