A bag contains 8 numbered table tennis balls inside. Two balls are numbered 1, three are numbered 2, and three are numbered 3. Let the discrete random variable X = "number on a table tennis ball." What are the expected value, variance, and standard deviation?

Which one ? is the answer and how to find this answer

Circle a has a diameter of 7 inches, a circumference of 21.98 inches, and an area of 38.465 square inches. the diameter of circle b is 6 inches, the circumference is 18.84 inches, and the area is 28.26 square inches. part a: using the formula for circumference, solve for the value of pi for each circle. (4 points) part b: use the formula for area and solve for the value of pi for each circle. (4 points)

Aright triangle has an area of 21 m2. the dimensions of the triangle are increased by a scale factor of 4. what is the area of the new triangle