The state test scores for 12 randomly selected high school seniors are shown on the right. Complete parts(a) through(c) below.

Assume the population is normally distributed.

1422

1225

983

700

727

838

723

742

540

630

1440

948

(a) Find the sample mean.

x=_______

(Round to one decimal place asneeded.)

(b) Find the sample standard deviation.

s=_______

(Round to one decimal place asneeded.)

(c) Construct a 95% confidence interval for the population mean .

A 95% confidence interval for the population mean is (_______,_______)

(Round to one decimal place asneeded.)