Question 1133708
x=(x-mean)/sd or (xbar-mean)/sigma/sqrt (n)
single, -10748/38000=z=-0.36
and -8828.7/38000=z=-0.23
probability x is in that interval is 0.0496

For a sample of 98, the Std Error of Mean is 38000/sqrt(98)=3838.6
now the z is between -2.80 and -2.30.  That probability is 0.0082