P(z < 3)
From the normal distribution table,
P(z < 3) = 0.9987
Your expression would be: 240-233
The correct answer is: The Ertan Dam is 7 meters higher than the Hoover Dam.
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False
because tan^2 45 = 1^2 = 1
and sec^2 x = 1/ cos^2 45 = (sqrt2)^2 = 2
so the sum = 3
