Brett golfs for the forestville knights high school team. when he practices his putting, he can make a 10-foot putt 80% of the time. if brett takes 200 putts for practice, what is the standard deviation of the number of putts he will make?

The formula to calculate standard deviation from probability is \sqrt(n*p*(1-p)). n is the sample size, and 200 in this case (number of putts for practice). p is 80% or 0.8, the probability that he can make it. So the standard deviation is \sqrt(200*0.8*(1-0.8)=\sqrt(200*0.8*0.2)=\sqrt(16)=4.

f(x)=6-14+2x+3

f(x)=2x-5