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?

Question

Mathematics

Nikhil Meadows

5 January, 08:00

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?

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Sariah Kim · Answer 1

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.