The interval for mean sale price is $582 
According to statement
The given rates are 560, 468, 685, 534, 658, 593
Now,
Sample mean = X / n 
Put the values in it and then
(560+ 468+ 685+ 534+ 658+ 593) / 6 = 582.1667 
and use this formula S = sqrt [ X2 - n 2 / (n-1) ] 
and put the values in these and 
S = sqrt [ X2 - n 2 / (n-1) ] = 95.97179
So, The interval for mean sale price is $582 
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