What is the difference?
7-3=
A. 3
B. 4.
O c. 5
OD. 10
O E. 11

Carl's candies has determined that a candy bar measuring 3 inches long has a z-score of +1 and a candy bar measuring 3.75 inches long has a z-score of +2. what is the standard deviation of the length of candy bars produced at carl's candies?

How to do a maths question? i have a mock

What is the exact volume of the cone? (height is 9 cm, the radius is 15 cm)