Question

If p is the chance that a person sampled at random smokes, then 1 − p is the chance that the person doesn't. If 100 people are sampled at random, the variance of the sample will be 100p(1 − p). What two values of p will give a variance of 16? (Enter your answers as a comma-separated list.)

Answer 1

@sourwing

Answer 2

Any ideas? Hint: this problem can be expressed in the standard form of a quadratic equation, in which case the quadratic formula may be used.

Answer 3

100p*(1-p)=16