The standard deviation is approximately??

Step-by-step explanation:

Given

Required

Determine the standard deviation

First, we calculate the mean.

--- approximately

Next, subtract the mean from each data

Square the results above

Add the squared results

Divide by number of data, to get the variance

Square the above, to get the standard deviation

--- approximated

proofs involving isosceles triangles often require special consideration because an isosceles triangle has several distinct properties that do not apply to normal triangles.(more about triangle types) therefore, when you are trying to prove that two triangles are congruent, and one or both triangles, are isosceles you have a few theorems that you can use to make your life easier.

step-by-step explanation:

an isosceles triangle has two congruent sides and two congruent angles. the congruent angles are called the base angles and the other angle is known as the vertex angle. ∠bac and ∠bca are the base angles of the triangle picture on the left. the vertex angle is ∠abc