z = (X - μ) / σ = (80 - 70) / 8 = 10 / 8 = 1.25
Now, we look up the z-score of 1.25 in the standard normal distribution table, which gives us a probability of 0.211.
So, the probability that X is greater than 80 is:
$$P(X > 80) = 1 - P(X \leq 80) = 1 - 0.211 =
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