Example:
We have a population of 100 people, where only 60 of them love pizza.
So, the probability of success is 0.6
SD[x] = $\sqrt{pq} = \sqrt{0.6 \times 0.4} = 0.48 $
The definition of SD is :
"Standard Deviation (SD) is the measure of spread of the numbers in a set of data from its mean value."
"What does the value of the standard deviation (0.48) tell us?"
What kind of spread are we talking about in this pizza example ?