20 didn't do it for this one.
Answer:
Standard deviation = 4
Step-by-step explanation:
Given the following data;
Mean = 25
Variance = 16
To find the standard deviation;
Mathematically, standard deviation is given by the formula;

Substituting into the formula, we have;

Standard deviation = 4
Answer:
21=4 ?????
Step-by-step explanation:
huh???????????
it is true because al triangles angles MUST add up to 180