Question 1021892
Use the z score,
A.{{{z=(x-mu)/sigma=(50-49)/9=0.1111}}}
{{{P(z)=0.5442}}}
B.{{{z=-0.4444}}}
{{{P=1-P(z)=1-0.3284=0.6716}}}
C.{{{z[1]=(52-50)/9=0.3333}}}
{{{z[2]=1.5556}}}
{{{P=P(2)-P(1)=0.9401- 0.6306=0.3095}}}