I don't get it, please explain

Question

Based on a sample of 50 textbooks at the store, you find an average of 60.62 and a standard deviation of 18.4.

The point estimate is:  (to 3 decimals)

The 95 % confidence interval (use z*) is:  to  (to 3 decimals)

Answer 1

The point estimate is the mean (60.62)

The 95% CI is mean +/- z* * standard deviation/square root(sample size)

= 60.62 +/- 1.96* 18.4 / sqrt(50)