Here's how to approach this problem. First write down the given variables as stated in the problem.
Now, recall that Standard deviation (sd) = √ variance
Substitute the values we were given in the problem;
sd = √ 16 = 4
With the help of the standard normal distribution table;
P(X > 15.2) = P ( Z > (15.2 - 14) / 4 )
= P(Z > 0.3)
= 1 - 0.6179
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