Question

If the random variable x is normally distributed with a mean equal to .45 and a standard deviation equal to .40, then P(x ≥ .75) is:

Answer 1

P(x ≥ 0.75) = P(z ≥ (0.75 - 0.45)/0.40) = P(z ≥ 0.30/0.40) = P(z ≥ 0.75) = 1 - P(z < 0.75) = 1 - 0.077337 = 0.22663