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The state test scores for 12 randomly selected high school seniors are shown below. Complete parts​...

The state test scores for 12 randomly selected high school seniors are shown below. Complete parts​ (a) through​ (e) below.

Assume the population is normally distributed.

1421
1230
986
694
722
836
723
750
544
625
1446
949

(a) Find the sample mean=   (Round to one decimal place as​ needed.)

(b) find sample standard deviation= (Round to one decimal place as​ needed.)

(c) construct 90% confidence interval =    _ , _   

(d) construct 95% confidence interval =    _ , _

(e)  construct 99% confidence interval =    _ , _

Math   Statistics-And-Probability   
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