# Normal Distribution, cant seem to reach the right answer

The scores on a statistics test are Normally distributed with parameters mean = 80 and standard deviation = 196. Find the probability that a randomly chosen score is no greater than 70

My attempt,

Pr(X < 70) = Pr(z < -0.05) = 1 - Pr(z < 0.05) = 1 - 0.5199 = .4801.

• Can you explain how you got $Pr(z < -0.05)$? Not that your answer says "48% of people score below 70\$, which doesn't seem to jive with "50% scored below 80". Jan 19 '14 at 17:26