If Z Is a Standard Normal Variable, Find the Probability $\frac { 1 } { 4 }$

If Z is a standard normal variable, find the probability
-Between 9.5 pounds and 11 pounds

A) $\frac { 1 } { 4 }$

B) $\frac { 1 } { 3 }$

C) $\frac { 1 } { 2 }$

D) $\frac { 3 } { 4 }$