Answer:
The standard deviation is 2.6832815729997
Step-by-step explanation:
SD^2=(12-12)^2+...+(14-12)^2/10
SD^2=72/10
SD^2=7.2
SD=squeare root of 7.2
SD=2.6832815729997
The range for the data given is 11
Cara's brother is 7 years old.
14 is twice as much as 7 (7 * 2 = 14).
Check the picture below.
make sure your calculator is in Degree mode.