Variance of a continuous random variable X is defined as
Standard deviation is defined as

Hence standard deviation is the positive square root of variance.
What would you need help with the most with this big problem?
I need point sorry for wasting your time
Answer:
The diameter is 13cm and the radius is 6.5cm
Step-by-step explanation:
The diameter is the line that goes across the circle and the radius is half the diameter. So...
13cm is the diameter
divide by 2 to get the radius...
6.5 cm
hope this helps :)