Question 1128414
z=(x-mean)/sd
z>(210-197.5)/8.6 or z>1.45 
That probability is 0.0735

For 20, the denominator is sigma/sqrt(n)  That is 8.6/sqrt(20)
that would be 1.92, the z value is >-1.5/1.92 or >-0.78 
The -1.5 is for 196-197.5 and that is divided by the 1.92
The probability is 0.7823