C. −6, is the best option
Answer:
The confidence interval is 6.6<μ<6.8.
Step-by-step explanation:
We have:
Number of observations = 601
Mean = 6.7
Standard deviation σ = 1.5
The z-score for a 95% confidence interval is 1.96.
The limits of the confidence interval can be calculated as

The confidence interval is 6.6<μ<6.8.
Just plug the inequality in desmos and you get 7<x<13
53.67 to one decimal place is 53.7 since you round the .6 to the .7