0,752 0,752 4,5-1,9636 4,5 +1,9636 [4,255; 4,745]

The operating life of EURH watches follows a
normal distribution with a standard deviation of 0.75 years. A
sample of 36 of these watches is taken with replacement and in this sample,
an average operating life of 4.5 years was observed.
Construct a confidence interval at the 95% confidence level
to estimate the average operating life. 

Answer:image

Can you please use calculate without Excel