Refer to ;
Cumulative Area Under the Standard Normal Distribution Table
D=(X-Mean)/(Standard Deviation)
Mean =78
Standard Deviation =8
X=88
D=(88-78)/8=10/8=1.25
For D=1.24, N(d)=0.8925
For D=1.26, N(d)=0.8962
For D=1.25,
N(d)=(0.8925+0.8962)/2=0.89435
Probability of X<88=0.89435
Probability of X>88=1-0.89435=0.10565
P(x>88)=0.10565
You can also use NORM.DIST function of excel to find cumulative probability of X=88, with Mean=78 and Standard Deviation=8
The image of excel function is attached
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