Small mean problem. grandfather clocks have a particular market in auctions. you are given a random sample of 21 purchases of grandfather clocks at auctions in pennsylvania. the sample statistics are:

mean = $1,343.04
std dev = $414.04
c. v. = 30.83
n = 21
you are asked to create a 90% confidence interval around the price for this sample.

the boe for this confidence interval is? i just want the answer. use 3 decimal places for your answer and use the proper rules of rounding.