Question

An automobile insurer has found that repair claims have a mean of $920 and a standard deviation of $870. Suppose that the next 100 claims can be regarded as a random sample from the long-run claims process. The probability that the average, x bar, of these 100 claims is larger than $1,000 is approximately

Answer 1

you can play around with Z Table stuff at

http://davidmlane.com/hyperstat/z_table.html