What is a 95 confidence interval forSolutionConfidence inter

What is a 95% confidence interval for

Confidence interval for population mean (Mu) is
sample mean +/- confidence coefficient*standard error of mean
Confidence coefficient is critical value of t for 99 degrees of freedom for 95% confidence level = 1.984
Standard error of mean = s/sqrt n
= 2/sqrt 100
= 0.2
Therefore the CI is
7 +/- 1.984*0.2
7 +/- 0.4
CHOICE (C) is the answer