Adistribution of measurements is relatively mound-shaped
with mean 50 and standard deviation 10.
if a measurement is chosen at random from this distribution, what is the probability that it will be greater than 60?

Since approximately 68% of a (roughly) normal distribution falls within one standard deviation of the mean, that leaves 32% that falls outside, and by symmetry 16% should lie above one standard deviation of the mean.

Ithink it's the first one ( let me know if it right)

Ineed on quadratic equations to solve problems